docs: adds website contributing doc

[cdrage]

docs: adds website contributing doc

What does this PR do?

Adds a website contributing doc with some initial information / templates on how to write documentation so we have some consistency in writing documentation.

Screenshot / video of UI

N/A

What issues does this PR fix or reference?

Closes https://github.com/containers/podman-desktop/issues/1861

How to test this PR?

N/A, it's docs

Signed-off-by: Charlie Drage [email protected]

[cdrage]

@deboer-tim Updated the PR to take care of the rest of the suggestions from https://github.com/containers/podman-desktop/issues/1861

I did not include vale as we no longer use that.