Hide full calendar under a collapsible; show full address on hover

[leafcompost]

Since NextCloud doesn't really let you customize the iframe calendar color scheme, currently the calendar looks a tad striking on the home page black background. This change makes it so that the calendar is hidden by default under a <details>.

Also sneak in a change where you can hover over the address to get the full street address and a link to the "Getting Here" wiki.

[cschmittiey]

rocket emoji, 100 emoji

[mjsir911]

gah I hate that we can't set nextcloud to always use display dark mode because it looks fine on my machine