Improve archiving from etherpad URL

[gRegorLove]

From chat today with @capjamesg and @tantek:

It would be nice if we could use only an etherpad URL with the command:
!archive https://etherpad.indieweb.org/YYYY-MM-DD-hwc-shortname

Suggested parsing:

• Parse the ISO8601 YYYY-MM-DD format date from the etherpad slug, set that as the date
  • If none found, set date as "ADD DATE"
• Find the common HWC shortname in the etherpad slug and set the full event_name:
  • hwc-europe = "Homebrew Website Club Europe/London"
  • hwc-pacific = "Homebrew Website Club - Pacific"
  • If no common short name found, default to "Homebrew Website Club"
• Find the first events.indieweb.org link in the etherpad contents, set that as the permalink
  • If none found, set permalink as https://events.indieweb.org

Then the final wiki page contents would be:

<dfn>[`permalink` `event_name`]</dfn> was an IndieWeb meetup on Zoom held on `date`.

Archived from: `etherpad_url`

`etherpad contents`

HWC Organizers would need to ensure:

• their etherpad slugs use the format listed above
• the events.indieweb.org permalink is added somewhere in the etherpad

Thoughts?

[capjamesg]

For reference, this was discussed a lot here: https://chat.indieweb.org/meta/2023-03-30#bottom

[gRegorLove]

I've made some good progress on this. Hoping to have a PR ready this weekend.

[capjamesg]

Amazing! Thank you!