Add config for chains

[afrittoli]

Add configuration for chain docs. Front matter is missing so adding some basic one just to test the PR. The docs include images at least one image (the logo) which does not work as the only mime type supported for in-repo data is text / markdown - which is something we need to fix in the sync script.

This also adds support for using "." to get documents from the repo root.

Signed-off-by: Andrea Frittoli andrea.frittoli@gmail.com

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[afrittoli]

@AlanGreene @geriom @vdemeester @priyawadhwa this should be ready to merge

[afrittoli]

@tektoncd/website-maintainers this is ready to go - it would be good to merge it

[tekton-robot]

@vdemeester:

In response to [this](https://github.com/tektoncd/website/pull/322#pullrequestreview-813938191): >/meow Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: priyawadhwa, vdemeester

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[AlanGreene]

Looks good, nice to see the list of projects on the website grow! 👍 /lgtm