Automatically get archive.ph URLs in Slack for paywalled sites.
You must have an env file called .dev.vars with the following variables
SLACK_APP_ID=AXXXXXXXXXX
SLACK_BOT_TOKEN=xoxb-XXXXXXXXXXX-XXXXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXXXXXX
SLACK_SIGNING_SECRET=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
SLACK_VERIFICATION_TOKEN=XXXXXXXXXXXXXXXXXXXXXXXX
ARCHIVE_BOT_SLACK_ID=UXXXXXXXXXX