reference/config.md: new page
- Close #243, #255, #256, #257, #196
- Changes should be cherry-picked to
24.2: no - Staging: https://docs.binary.picodata.io/picodata/asabirov_add_picodata_config/reference/config/
- Follow-up for picodata!893 (merged), picodata!907 (merged), picodata!913 (merged)
Edited by Artur Sabirov