docs - Add contributor's guide and refactor contacts

[izmalk]

Description of issue or feature:

We want to get rid of the dedicated contacts page (as it should not be a part of the products documentation directly, as the first-class citizen).

Solution:

We create a contributor's guide, put the contact information there and update all the links.
Additionally, a few minor changes:

We provide additional navigation opportunities for people to navigate to the guide.
We update the CONTRIBUTING.md in the repo to have a link to the Contributor's guide in the docs.
We also add SECURITY.md file as this is best practice to have one at the reoot of our repo.
Finally, we add relative links block to the home page, just because we can.

How was this change tested?

• Manually
• Unit tests
• Integration tests

See PR preview.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[izmalk]

The linkcheck is failing due to the absence of SECURITY.md in the branch yet (before the merge).

[smethnani]

Thanks @izmalk! Just a comment on the branch but otherwise LGTM!

[smethnani]

Shouldn't this be 2/edge?

Suggested change

	request branch onto the `main` branch. This also avoids merge commits and
	request branch onto the `2/edge` branch. This also avoids merge commits and

[smethnani]

Suggested change

	2. Raise a pull request against `main` to start the review process.
	2. Raise a pull request against `2/edge` to start the review process.

[smethnani]

Suggested change

	`main` and modify the documentation files as necessary.
	`2/edge` and modify the documentation files as necessary.