Rebrand application from Thinkify to Think-Bro

[Copilot]

The repository is named "Think-Bro" but the application was branded as "Thinkify" throughout. This PR aligns all branding to "Think-Bro".

Changes

User-facing text:

• HTML title, README documentation, UI components (NavBar, Footer, Banner, FAQ)
• Support email: support@thinkify.com → support@thinkbro.com

Code architecture:

• ThinkifyContext → ThinkBroContext
• useThinkify → useThinkBro (renamed hook and file, updated 21 import sites)

Bonus fix:

• Corrected malformed Linux installation instructions in README (referenced full URL instead of file extension)

-import useThinkify from "../hooks/useThinkify";
+import useThinkBro from "../hooks/useThinkBro";

-const { ... } = useThinkify();
+const { ... } = useThinkBro();

Original prompt

bro is bro

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