Update list of Solid servers

[jeswr]

There are approximately 14 codebases that were recently found in a CG survey. The servers page only lists 7.

[elf-pavlik]

I think it would be useful to use something like https://github.com/solid/catalog as underlying knowledge graph
Eventually I would like to add conformance information to https://elf-pavlik.github.io/solid-efforts/#/?tab=services
Unless implementations self-publish the data, dataset like soild catalog would be a second best place to make it available.