Generate configuration-reference.md

[rfratto]

The configuration reference document is currently hand written, large, and subject to change when updating vendors. It would be nice to have a script that autogenerates the entire document. Cortex has something like this for its equivalent config reference that could be used for inspiration.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[quinndiggity]

Just a note, there are a ton of references in the https://grafana.com docs that refer to items like https://github.com/grafana/agent/blob/master/docs/configuration-reference.md which are all 404'ing - for example, several of the first pieces of documentation users see, one of which being https://grafana.com/docs/grafana-cloud/how-do-i/agent/

[marctc]

@rfratto I didn't find this document anymore, so I guess the problem is already fixed.