Add more docs

[woile]

This PR adds the following:

• an examples folder
• an example for devShell
• templates are no longer marked as examples, now there are templates and examples avoiding confusion

#170

[roberth]

Made a couple suggestions, but overall a good example.
I'll try to be quicker next time.

[woile]

Thanks for all the awesome feedback, I've updated the PR!

[woile]

Added another very easy example with mission-control.

[woile]

Everything updated 🚀

[roberth]

bors r+

[bors]

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• ci/hercules/evaluation
• ci/hercules/onPush/default

[roberth]

Thank you @woile!

[woile]

No problem, I'll send more PR's as I come up with working snippets, and I'll try to add more tutorials to the website. Any idea if it's possible to show snippets from the examples/ folder into the website? I want to use mdbook snippets but there are 2 different repos.

[roberth]

We could change flake.parts-website to copy them in using the flake-parts flake input's outPath ie cp -r ${inputs.flake-parts}/examples ./somewhere.
It auto updates twice a day and you can use nix build --override-input flake-parts ./flake-parts ./flake.parts-website to build locally.