Add Intro to CSC and CSC explorer pages to Side Bar

[ryan-foamspace]

Intro to CSC and CSC explorer pages should be added to the side menu, right now only available through search

• https://f-o-a-m.github.io/foam.developer/tutorials/intro_to_csc.html
• https://f-o-a-m.github.io/foam.developer/sampleApplications/csc-explorer.html