Automate lists-of-conventions in README files or remove them #1695
Description
We have several files listing available conventions that are usually out-of-date:
- https://github.com/open-telemetry/semantic-conventions/blob/main/docs/README.md
- https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/metrics.md
- https://github.com/open-telemetry/semantic-conventions/blob/main/docs/messaging/README.md
- https://github.com/open-telemetry/semantic-conventions/blob/main/docs/database/README.md
- ...
We can try autogenerating such sections or avoid listing them at all.