* Add repo metadata, start with categories!
scripts for checking repo categories, updating the canonical set
added categories to push.pl
* Add initial set of semi-acurate categories
* Adjustments following tianon's review
* Simplify metadata.sh use cases (CI or interactive); just diff and check all the time
Update README.md about metadata.sh usage
* Unify the categories checks into one jq expressions
* Update initial categories
* Link to Docker docs for categories; minor categories script adjustments
This should make it much faster to find the right place to file issues, get help, find out whether upstream maintains an image, etc.
I've done my best to represent each `REPO/maintainer.md` file appropriately, but I might have missed some (or there might be something else a maintainer prefers be listed there, either more or less descriptive, for example), which would be welcome contributions following this change.
yosifkit