Collect backlinks to rustc-dev-guide reading club sessions

[jieyouxu]

The zulip thread for the reading club initiative is https://rust-lang.zulipchat.com/#narrow/channel/196385-t-compiler.2Fwg-rustc-dev-guide/topic/Rustc.20dev.20guide.20reading.20club, but the actual meetings happened in separate threads which easily becomes burried in the channel. We should add a smol section somewhere that collects backlinks to each reading club meeting and the rough topic.

[jieyouxu]

• 2024-11-20: https://rust-lang.zulipchat.com/#narrow/channel/196385-t-compiler.2Fwg-rustc-dev-guide/topic/.5Breading.20club.5D.202024.2E11.2E20.20chapter.2040.20to.2042