Sync site to canonical Project-Lithon/Lithon + remove numbered use-case cards

[Tenuka22]

What

• Site links: replace all MotherOfProgrammers/Lithon GitHub links with canonical Project-Lithon/Lithon across docs/public/src/ (10 HTML pages + home.ts/home.js clone URL + REPO const + contributors API). README already uses Project-Lithon/lithon.git.
• Use-cases page: remove the 3 numbered 0/1/2 feature cards (Low-latency services / Native utilities / Learning compilers).
• Benchmark videos: 7 mp4s already on this branch in bench_vid_maker/results/ (euler_lim, fsum_1b, fsum_1b_1core/4core/6core/8core, fsum_1k) verified with ffmpeg -v error null decode.

Verification

• impeccable detect on index.html / use-cases.html / docs.html: no new issues from edits.
• All 7 .mp4 files decoded cleanly; all 7 .json results have valid wall-clock times and matching sums.
• No Co-Authored-By trailer on commit 649bb82.

Note

The 7 benchmark videos were already committed to this branch previously (Oct 4). This PR adds the site-link + card-removal commit on top.

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