Desktop Communities Page SEO Updates & Title Text

[WishingWell13]

Requires #304

See #306 (review)

it'd be better if all the community info is always rendered, one after the other. Then, the diamond icons can just link to each section

like

<div class="communities">
  <a href="#ai">AI diamond</a>
  <a href="#cyber">Cyber diamond</a>
  <a href="#hack">Hack diamond</a>
  <a href="#design">Design diamond</a>
</div>

<div id="ai">...</div>
<div id="cyber">...</div>
<div id="hack">...</div>
<div id="design">...</div>

This just makes things simpler accessibility wise, plus it probably helps with SEO (this way, for example, when Google scrapes /communities, it can find the link to https://ai.acmucsd.org/)