add pycsw to Server Tools & Resources

[tomkralidis]

Hi all: I'd like to add pycsw as a STAC API server to https://stacspec.org/en/about/tools-resources

It was suggested by @gadomski to add to stacindex.org, which could be feeding stacspec.org. pycsw was successfully added to stacindex.org, but I don't see the update on stacspec.org.

Any ideas? I do see that this repo has a gh-pages branch (which appears to be last built in April 2022), but not sure whether this is powering stacspec.org.