Migrate notes for each class into different pages

[shreystechtips]

The logic behind this is to manage the growing number of notes in the website. Every time on load, the website has to render all of the note cards, which will continue to grow over time.
To fix this problem. I will createPage for each class and then have all corresponding notes there (i.e. notes.shrey.ml/cs70 will contain all notes for cs70). The landing page for notes.shrey.ml will only list the different classes I have notes for with a brief description.
This will increase speed and clean up the UI for those only looking for notes from certain classes