diff --git a/.github/workflows/build-test-deploy.yml b/.github/workflows/build-test-deploy.yml
index 349f74d..47a0af7 100644
--- a/.github/workflows/build-test-deploy.yml
+++ b/.github/workflows/build-test-deploy.yml
@@ -48,6 +48,10 @@ jobs:
         run: yarn install --immutable
 
       - name: Generate sitemap
+        env:
+          # For repository named username.github.io, use https://username.github.io
+          # For other repositories, use https://username.github.io/repository-name
+          SITE_URL: ${{ github.event.repository.name == format('{0}.github.io', github.repository_owner) && format('https://{0}.github.io', github.repository_owner) || format('https://{0}.github.io/{1}', github.repository_owner, github.event.repository.name) }}
         run: yarn run generate-sitemap
       - name: Upload build artifact, ready for GitHub Pages deployment
         uses: actions/upload-pages-artifact@v3
diff --git a/.htmlvalidate.mjs b/.htmlvalidate.mjs
index 56a5106..ed20daa 100644
--- a/.htmlvalidate.mjs
+++ b/.htmlvalidate.mjs
@@ -4,6 +4,20 @@ export default defineConfig({
   plugins: ["<rootDir>/test/plugin.html-validate.mjs"],
   extends: ["html-validate:prettier", "<rootDir>/test/plugin.html-validate.mjs:recommended"],
   rules: {
+    "allowed-links": [
+      "error",
+      {
+        allowExternal: {
+          exclude: ["\\\\?utm_source=chatgpt.com", ".htm[l]?$"],
+        },
+        allowRelative: {
+          exclude: [".htm[l]?$"],
+        },
+        allowAbsolute: {
+          exclude: [".htm[l]?$"],
+        },
+      },
+    ],
     "pacific-medical-training/mailto-awesome": "error",
     "pacific-medical-training/external-links": "error",
     "pacific-medical-training/no-jquery": "error",
diff --git a/package.json b/package.json
index a78362a..790799e 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "structured-data-testing-tool": "^4.5.0"
   },
   "scripts": {
-    "test": "yarn node test/fixtures-html-validate-should-fail.mjs && yarn node test/fixtures-structured-data-should-fail.mjs && yarn node test/build-html-validate.mjs && yarn node test/dirty-words-checker.mjs && yarn node test/dirty-file-paths-checker.mjs && yarn node test/build-structured-data-validate.mjs",
+    "test": "yarn node test/fixtures-html-validate-should-fail.mjs && yarn node test/fixtures-structured-data-should-fail.mjs && yarn node test/build-html-validate.mjs && yarn node test/dirty-file-paths-checker.mjs && yarn node test/build-structured-data-validate.mjs",
     "test-structured-data": "yarn node test/build-structured-data-validate.mjs",
     "lint": "yarn prettier-check && yarn markdownlint-check",
     "lint-fix": "yarn prettier-fix && yarn markdownlint-fix",
diff --git a/scripts/generate-sitemap.mjs b/scripts/generate-sitemap.mjs
index 2e9c758..abf2744 100644
--- a/scripts/generate-sitemap.mjs
+++ b/scripts/generate-sitemap.mjs
@@ -3,7 +3,9 @@ import path from "path";
 import https from "https";
 import { parseString } from "xml2js"; // Using xml2js for XML parsing
 
-const site = "https://www.acls.net";
+// Site URL configuration - can be overridden via SITE_URL environment variable
+// For GitHub Pages, this should typically be https://username.github.io/repository-name
+const site = process.env.SITE_URL || "https://www.acls.net";
 const buildFolderPath = path.join(process.cwd(), "build");
 const sitemapPath = path.join(buildFolderPath, "sitemap.xml");
 const daysThreshold = 30; // Number of days to compare for updating lastmod
diff --git a/test/dirty-words-checker.mjs b/test/dirty-words-checker.mjs
deleted file mode 100644
index 0b3336d..0000000
--- a/test/dirty-words-checker.mjs
+++ /dev/null
@@ -1,85 +0,0 @@
-import fs from "fs";
-import path from "path";
-import { glob } from "glob";
-
-const CONFIG_FILE = path.join(process.cwd(), "test", "dirty-words.json");
-const BUILD_DIR = path.join(process.cwd(), "build");
-
-// Load and parse the configuration file
-function loadConfig() {
-  try {
-    const configContent = fs.readFileSync(CONFIG_FILE, "utf-8");
-    return JSON.parse(configContent);
-  } catch (error) {
-    console.error("Error loading configuration:", error.message);
-    process.exit(1);
-  }
-}
-
-// Check all files in the build directory
-function findTargetFiles() {
-  return glob
-    .sync("**/*", {
-      cwd: BUILD_DIR,
-      nocase: true,
-      dot: false,
-    })
-    .filter((file) => {
-      const fullPath = path.join(BUILD_DIR, file);
-      return fs.lstatSync(fullPath).isFile();
-    });
-}
-
-// Check a single file against all patterns
-function checkFile(filePath, patterns) {
-  const fullPath = path.join(BUILD_DIR, filePath);
-  const content = fs.readFileSync(fullPath, "utf-8");
-  const violations = [];
-
-  patterns.forEach((pattern) => {
-    const flags = pattern.ignoreCase ? "gi" : "g";
-    const regex = new RegExp(pattern.regexp, flags);
-
-    const matches = content.match(regex);
-    if (matches) {
-      violations.push({
-        pattern: pattern,
-        matches: matches,
-        count: matches.length,
-      });
-    }
-  });
-
-  return violations;
-}
-
-console.log("🧪 Testing files for dirty words");
-
-const config = loadConfig();
-const files = findTargetFiles();
-let hasErrors = false;
-
-files.forEach((file) => {
-  const violations = checkFile(file, config);
-
-  if (violations.length > 0) {
-    hasErrors = true;
-    console.log(`❌ ${file}:`);
-
-    violations.forEach((violation) => {
-      const { pattern, matches, count } = violation;
-      console.error(`   ${pattern.severity.toUpperCase()}: ${pattern.note}`);
-      console.log(`   Found ${count} matches:`);
-      matches.forEach((match) => {
-        console.log(`     "${match}"`);
-      });
-    });
-  }
-});
-
-if (hasErrors) {
-  console.error("\n❌ Dirty words check failed");
-  process.exit(1);
-} else {
-  console.log("✨ All files passed dirty words check!\n");
-}
diff --git a/test/dirty-words.json b/test/dirty-words.json
deleted file mode 100644
index 5c2a6fa..0000000
--- a/test/dirty-words.json
+++ /dev/null
@@ -1,20 +0,0 @@
-[
-  {
-    "regexp": "\\?utm_source=chatgpt.com",
-    "severity": "error",
-    "ignoreCase": true,
-    "note": "Copied a link from Chat GPT without reviewing it"
-  },
-  {
-    "regexp": "<\\s*title\\s*>[^<]*\\&amp;amp;[^<]*",
-    "severity": "error",
-    "ignoreCase": true,
-    "note": "Double-escaped HTML quoting"
-  },
-  {
-    "regexp": "href\\s*=\\s*\"[^:]+\\.htm[l]?\"",
-    "severity": "error",
-    "ignoreCase": true,
-    "note": "Linking to an HTML page with the extension .html or .htm"
-  }
-]
diff --git a/test/fixtures/required-results.json b/test/fixtures/required-results.json
index b0b9eae..3944351 100644
--- a/test/fixtures/required-results.json
+++ b/test/fixtures/required-results.json
@@ -13,6 +13,18 @@
     }
   ],
   "test/fixtures/external-link-broken.html": [
+    {
+      "ruleId": "allowed-links",
+      "severity": 2,
+      "message": "External link to this destination is not allowed by current configuration",
+      "offset": 204,
+      "line": 9,
+      "column": 14,
+      "size": 66,
+      "selector": "html > body > a:nth-child(1)",
+      "ruleUrl": "https://html-validate.org/rules/allowed-links.html",
+      "context": "external"
+    },
     {
       "ruleId": "pacific-medical-training/external-links",
       "severity": 2,
@@ -59,6 +71,18 @@
     }
   ],
   "test/fixtures/internal-link-broken.html": [
+    {
+      "ruleId": "allowed-links",
+      "severity": 2,
+      "message": "Absolute link to this destination is not allowed by current configuration",
+      "offset": 204,
+      "line": 9,
+      "column": 14,
+      "size": 36,
+      "selector": "html > body > a",
+      "ruleUrl": "https://html-validate.org/rules/allowed-links.html",
+      "context": "absolute"
+    },
     {
       "ruleId": "pacific-medical-training/internal-links",
       "severity": 2,