Changes to match icssc/docs#33

[laggycomputer]

Description

Finishes the work of icssc/docs#33 by:

• Removing CONTRIBUTING.md; this was moved to docs.
• Changing links consistent with that PR.

Please merge and deploy this simultaneously with icssc/docs#33 to avoid broken links.

Related Issue

Closes #58.

Motivation and Context

As the issue mentions, the docs could use significant improvements in organizational clarity and beginner-friendly approach.

How Has This Been Tested?

No need to test visual changes of this nature.
Corresponding docs pages were obviously tested.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code involves a change to the database schema.
• My code requires a change to the documentation.