Deprecate Static Assets Plan

[StachuDotNet]

• collect list of users who have previously upload static assets
  (there are 544 canvases with static assets as of mar 3, 2023)

Limiting new usages

• store "upload allowlist"
  (k8s? hard-coded?)
• update code: only users who are in that list can upload static assets

Reducing current usages to 0 (so we can deprecate)

• store "keep my data list" (just allowing to serve existing assets)
  (k8s? hard-coded?)
• occasionally, purge assets outside of the "keep my data" list
• ask users if they're really using the feature
• ask users if we can at least put them on the keep-my-data list and not the allow-uploads list, every ~6 months

Present options
.....