docs: make front page cards clickable and claims verifiable

[Giri-Aayush]

Front page pass

Reason

• The cards only showed their border and chevron on hover, and phones have no hover, so on mobile they read as plain headings.
• The feature bullets couldn't be checked and linked nowhere. Rewrote each one as a short label linking to the page that shows it, the way Morpho does. Copy edits follow Google's guidance on plain language
• Also fixed the star link, GitHub removed /stargazers (on every repo, screenshot below), pointed X at the live handle, and reordered the cards to how they're used from ICP perspective hardware, run, snapshot, configure, interact.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.18%. Comparing base (121146c) to head (dd71570).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4034      +/-   ##
==========================================
- Coverage   79.31%   79.18%   -0.13%     
==========================================
  Files         464      464              
  Lines       35793    35787       -6     
==========================================
- Hits        28389    28338      -51     
- Misses       7395     7440      +45     
  Partials        9        9              

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