Add Intro to CSC and CSC explorer pages to Side Bar 

 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