Update the updates list (#19)

The list of updates on the README only shows 2024-01.

This PR replaces it with a link to
https://python.github.io/editorial-board/updates/ so it doesn't need to
be updated each month.

If you do want a list of all updates on the README, you could use this
handy tool called [cog](https://github.com/nedbat/cog) ;)

For example:
https://github.com/python/steering-council/blob/55f9ea874d247ec80e0f975901fd518f940eaf1e/Makefile#L1-L4

---------

Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>

Author: hugovk

README.md

@@ -10,9 +10,8 @@ We have a "changelog" of decisions: [CHANGELOG.md](CHANGELOG.md).
 
 ## Updates
 
-These updates provide high level information about the Editorial Board's activities:
-
-- [2024-01](content/updates/2024-01-08-editorial-board-update.md)
+[Read updates](https://python.github.io/editorial-board/updates/) of the Editorial Board's activities.
+Subscribe to the updates using the [RSS feed](https://python.github.io/editorial-board/updates/index.xml).
 
 ## Process