Docs/fix typos and formatting

[juliancervos]

This PR addresses a few minor typos, spelling mistakes, and formatting inconsistencies I noticed while reading through the MAS developers' documentation. Additionally, it adds a .gitignore file and a Gemfile.lock to improve the local testing workflow for future contributors.

Changes Made

• Documentation Fixes: Corrected typos and polished page formatting across documentation files (using interactive commits for clean separation). I split this into 3 commits (roughly):
  • df89bfd (...typos...): for changes that corrected mistakes/typos and should be pretty straightforward
  • 8aa134d (...American and British spelling...): for switching to British spelling consistently
  • 5d24414 (...formatting...): for formatting and style things that I thought could be more consistent or were missing, but maybe there's a reason why it is like that
• Workflow Improvements: Added a standard .gitignore to prevent committing local Jekyll build files (like _site/ and .jekyll-cache/). Added Gemfile.lock for consistent local rendering environments.

Verification

• Ran bundle exec jekyll serve locally.
• Verified all modified documentation pages render correctly and links function as expected on http://localhost:4000.