This causes the mailbox to automatically reload the page every 60
seconds, without JavaScript.

This also updates the base template data to include the full URL, and
replaces the earlier "Path" field with a pre-split array of path
components, which is more immediately useful to most templates given the
limitations of string munging with text/template primitives.

UIDs are not first-class WebDAV citizens and would require two
roundtrips for most operations.

These haven't been renamed yet.

Go back to the right page.

This allows us to extend these and expose helpers for templates and
plugins.

This alows to add/remove flags instead of setting them.

Only inline forwarding is supported for now.

References: https://todo.sr.ht/~sircmpwn/koushin/37

Latest linkify contains a fix for e-mail addresses surrounded by angle
brackets.

Loading remote resources by default has privacy implications.

This reverts commit 02faf6174b.

This commit doesn't work, because it's applied to <img> tags. Making it
handle <a> tags doesn't work either because bluemonday will strip any
target="_blank" attributes, making the compose form open in the
<iframe>. Let's just revert this whole commit for now.

Closes: https://todo.sr.ht/~sircmpwn/koushin/33

Closes: https://todo.sr.ht/~sircmpwn/koushin/64

Fixes: 9d76488235 ("readme: add hint about SourceHut theme")