the "http" and "ssh" chips were block elements and not inline elements, and would grow according to other items in the flexbox. this pull reworks the clone-card to make chips inline, and enables overflow for urls.

needs frontend bits

- fix up filters
- fix missing icons bug
- fix missing close button

Can't use sh.tangled.repo.pull.state.{open,closed,merged} since
that results in a stateopen.go -- overwriting issue.state.open etc.
Hence, it's pull.status.

/:did/:repo/merge is only ever used when actually performing the merge,
so by this point all conflicts should've been rectified and the merge
*should* succeed. This is the appview's responsibility.

/:did/:repo/merge/check checks for mergeability, and can be used to
repeatedly check as the supplied patch is updated by the submitter.

It's not appropriate to put binaries in /; binaries installed external
to the package manager should be installed in /usr/local/bin or
/usr/local/libexec on most systems. Since it's not meant to be executed
by users directly, it's probably more appropriate to be in libexec;
also, since "keyfetch" is a rather generic name, it's probably better to
rename it as "tangled-keyfetch".

Signed-off-by: Runxi Yu <me@runxiyu.org>

- implemented in a backwards compatible way, introduces migrations and
updates an existing lexicon
- newly added field is not marked required, so we should still be able
to index old repo-create events properly

This should help alleviate the memory leakyness that was exhibited when
we stored the entire object.Commit in memory.

no cap

We're open to public!