Origin for each line in help.md from check-in c33161948b:

c33161948b 2024-05-13    1: start - Does nothing.
c33161948b 2024-05-13    2: add - `<@name> <url> [<iv hash>] [<substitute>]` — Adds new RSS feed to named channel.
c33161948b 2024-05-13    3: update - `<id> <@name> <url> [<iv hash>] [<substitute>]` — Updates given RSS feed, you can change target, feed URL and IV hash.
c33161948b 2024-05-13    4: clean - `<id>` — remove all history from the scraping, next scrape will post all found items
c33161948b 2024-05-13    5: check - `<id>` — check for new items, but all updates will be posted to your chat.
c33161948b 2024-05-13    6: disable - `<id>` — disable feed, no scraping will be done.
c33161948b 2024-05-13    7: enable - `<id>` — enable feed, next scrape will be scheduled.
c33161948b 2024-05-13    8: list - Lists all your created RSS feeds.
c33161948b 2024-05-13    9: delete - `<id>` — Remove RSS feeds and it's history.