Update Resources Styling

[nickclark2016]

Resource page numbering is incorrect. This is an artifact of markdeep's styling. Recommend removing markdeep TOC styling and using manual TOC. This should help to unify style between this page and the showcase.

Acceptance Criteria

• All existing resources are kept
• Style of resources page matches the showcase
• Numbering of resources in manual TOC is correct
• Markdeep TOC is removed

[painfulexistence]

Just an FYI, the newer version of Markdeep seems to have fixed the numbering.
I've created a PR to address the subheading numbering issue.