Misc docs, CMake, and packaging fixes

[aaron-skydio]

• CMake now fails if reading the version or generating the manifest fails
• Fixed skymarshal package classifiers
• Fixes #136
• Fixes broken link to paper and broken anchors in the README
• Fixes #141
• Clean up sidebar (no redundant link to home, bigger section titles)
• Consolidate tutorial symlinks into one symlink to a notebooks/tutorials directory
• Add READMEs for examples, do some cleanup there
• Rename 2d triangulation example to 2d localization, since I think that's more fitting?

I've gone ahead and republished the docs with the stylesheet fixes here, since that's just an immediate improvement IMO