Docs: Add meeting calendar and remove deprecated contact methods

[esnible]

Summary

Adds the Community Meeting calendar to the web site.
Removes deprecated contact methods (GitHub discussions)

(Optional) Testing Instructions

Bring this PR into your workspace and open index.html in a browser.

Fixes #

Resolves #73

[mrsabath]

Clean, well-scoped change — the calendar lands in the right column and the dead GitHub Discussions links are correctly removed from both spots. Links keep rel="noopener noreferrer", URLs are properly entity-encoded, and the markup is well-formed. CI green, signed-off, Resolves #73.

Two minor polish items inline (non-blocking): the embedded calendar iframe uses a fixed width="800" on an otherwise responsive page, so it'll overflow on mobile; and a title attribute would help screen readers. Both fine to fold in now or leave for a follow-up.

Areas reviewed: HTML/Docs, security (links/iframe), conventions, CI · Commits: 1, signed-off: yes · CI: passing

[mrsabath]

suggestion: this iframe has a fixed width="800". The page sets a mobile viewport (width=device-width) and the rest of the layout is responsive, so on narrow screens this will overflow horizontally. Consider dropping the fixed width in favor of style="border:0; max-width:100%" (or wrapping it in a responsive container) so it scales down on mobile.

[mrsabath]

nit: consider adding title="Kagenti community calendar" to the <iframe> — screen readers announce the title, and it's a small accessibility win.