Better link previews for rollcall votes #404
Description
Right now the link previews for twitter/slack/etc. for member pages are awesome because they use the Twitter cards, but rollcall votes give you:
https://i.imgur.com/tzVRItc.png
a) The grammar on the text is wrong and should be fixed
b) Rollcall pages should describe the rollcall and the outcome
It'd be hard to add a slug to URLs because the metadata quality just isn't there, but at least using the body for a description + outcome + vote division makes sense.