Create traefik-v2-docker.md

[williamtrelawny]

Current docs for Traefik config seem to be for Traefik v1 so I've provided some for v2.

I also have provided 2 scenarios- a) both Traefik and Pi-hole are containers on same Docker host, and b) Traefik is containerized but Pi-hole is remote.

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What does this PR aim to accomplish?:

Improve docs on using Traefik to proxy Pi-hole web.

How does this PR accomplish the above?:

Providing brand new doc for Traefik v2 which includes Docker config.

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[yubiuser]

I think @PromoFaux uses Traefik, so request his review.

[PromoFaux]

Overall looks good to me, however the navigation option is missing in the sidebar.

It should be added in here: https://github.com/pi-hole/docs/blob/master/mkdocs.yml#L185

[PromoFaux]

See comment

[williamtrelawny]

Overall looks good to me, however the navigation option is missing in the sidebar.

Check it out now @PromoFaux :)