Repository cleanup

[HarshCasper]

This issue proposes a few improvements that can be implemented with the docs repo:

• Removing node_modules will greatly help contributors as this bloats the repo size.
• Removing the build directory would be beneficial as well.
• Adding a .gitignore can help contributors ignore build files, auto-generated files and more.
• GitHub Actions can be used for a lot of accessibility, performance testing to optimize the social presence.

We can add more points around how we can make docs to be a viable place to contribute and have early contributors get started.

[nickvidal]

Great points @HarshCasper, thanks for proposing this!

[nickvidal]

And thanks for the PR: https://github.com/enarx/docs/pull/3