Expand Organization.sameAs once more social accounts exist

[yigitdot]

JSON-LD Organization.sameAs (in app/layout.tsx's organizationSchema) is the schema.org identity-graph field — every URL in the array tells Google "this is the same entity as the one at url," which lets the knowledge panel merge GitHub + X + LinkedIn + … into one org node.

sameAs currently lists links.github, links.x, and links.linkedin. The following networks are not yet wired up because deCDN has no public account on them at the time of writing:

• YouTube
• Discord
• Telegram
• LinkedIn — wired up in 7b81190

When any of the remaining accounts go live, add the URL to lib/links.ts and append it to the sameAs array in app/layout.tsx.

Acceptance

• Each newly-existing account is reachable from Organization.sameAs in the rendered out/index.html.