Add archive URLs

[matthewpalmer]

• Add the ability to link from a email in the app to the email on the website.
• Add to backend/database
• Add to app

[matthewpalmer]

This is proving to be tricky--it's pretty common for the archive url computed server side to fall out of sync with the actual url for a message. Still worth doing though I think

[matthewpalmer]

I really want to be able to e.g. open a link from twitter in safari, then copy that URL into Charter to read it there. That requires bidirectional matching up

[matthewpalmer]

This has the potential to be a lot of maintenance… unlikely to be worth it from a personal time investment perspective. I think search (maybe?) will help alleviate some of this.