site: update baseURL + description + home-page link to awsome-distributed-ai

[KeitaW]

Summary

Follow-up to #1104. The repo was renamed from awsome-distributed to awsome-distributed-ai earlier in 2026 — #1104 fixed the site title; this PR clears the three remaining stale references in hugo.toml:

-baseURL = "https://awslabs.github.io/awsome-distributed/"
+baseURL = "https://awslabs.github.io/awsome-distributed-ai/"

-  description = "Posts about distributed ML training on AWS — companion to awslabs/awsome-distributed."
+  description = "Posts about distributed ML training on AWS — companion to awslabs/awsome-distributed-ai."

-Companion to [`awslabs/awsome-distributed`](https://github.com/awslabs/awsome-distributed).
+Companion to [`awslabs/awsome-distributed-ai`](https://github.com/awslabs/awsome-distributed-ai).

Why each one matters

Line	Surface area
baseURL	Hugo uses this for absolute URLs in sitemap.xml, the RSS feed, and any template using absURL. GitHub Pages handles the redirect for human visitors, so the site was reachable, but external tools (RSS readers, OG-card crawlers, search engines) saw URLs pointing at the old repo path.
[params].description	Surfaces in the <meta name="description"> tag on every page — the snippet search engines and link-previewers display.
[params.homeInfoParams].Content	The home-page byline under "Distributed ML on AWS" — both the visible link text and the GitHub URL it points at.

After edit, grep -E 'awsome-distributed[^-]' hugo.toml returns no matches.

Test plan

• After merge, the deploy workflow rebuilds and:
  • The home page byline says awslabs/awsome-distributed-ai and the link target is https://github.com/awslabs/awsome-distributed-ai
  • The deployed sitemap at /sitemap.xml shows post URLs under awsome-distributed-ai, not awsome-distributed
  • The RSS feed at /index.xml matches