[docs] Wrong namespace used in configuration docs?

[kastl-ars]

First off: The docs are very well written, nice and easy to read and easy to understand. Hats off!

Just a small thing, there is a mismatch regarding the namespaces used:

mesh/docs/content/configuration.md

Line 126 in 638e27f

namespace: server

vs.

• https://github.com/traefik/mesh/blob/master/docs/content/quickstart.md?plain=1#L64
• https://github.com/traefik/mesh/blob/master/docs/content/quickstart.md?plain=1#L87
• https://github.com/traefik/mesh/blob/master/docs/content/quickstart.md?plain=1#L104

The quickstart uses the test namespace for server and client deployment, so it would make sense to stick to that and not use server

[kastl-ars]

https://github.com/traefik/mesh/blob/master/docs/content/configuration.md?plain=1#L173

A client namespace is also being used later on.