Missing libs on docs page

[chapulina]

These pages:

• https://ignitionrobotics.org/docs
• https://ignitionrobotics.org/libs

Are missing ign-tools and ign-cmake.

In a related note, it would be nice to alphabetize them so they're easier to find. In the future we could consider having an icon for each one so they're easier to spot.

[ahcorde]

• [x] Alphabetize libraries: https://gitlab.com/ignitionrobotics/web/web/-/merge_requests/14

[chapulina]

Generating tutorials for ign-cmake: https://github.com/ignitionrobotics/ign-cmake/pull/137

[mabelzhang]

Are we excluding sdformat from this list? Its tutorial link on https://ignitionrobotics.org/libs is broken.

[chapulina]

Are we excluding sdformat from this list?

That's being addressed as part of https://github.com/ignitionrobotics/docs/issues/32.

[azeey]

Fixed by #441