Create a all projects page

[Gkrumbach07]

As a visiter of Thoth's website, I want to be able to see all of the projects offered by Thoth so that I can explore what I might use or contribute to.

Acceptance Criteria

• [ ] Create a all projects page (see https://www.redhat.com/en/technologies/all-products for general layout)
• [ ] route should be /projects
• [ ] data should be pulled from markdown files using Gastby just like #253
• [ ] Page can have a side navigation panel for jumping to sections of the page. This is only if we plan on grouping projects into categories.