Improve Tailscale documentation

[Bencaddyro]

Have you checked your request hasn't been already addressed in another issue?

• [x] Yes

Is your content request an addition to an existing page?

• [x] Yes, this is the page : https://developers.clever-cloud.com/doc/reference/reference-environment-variables/#tailscale-support
• [x] No, the content is a new page/subject

Describe the content you'd like to see A page for Tailscale documentation, (rather than a shady text bloc on general purpose env var)

Additional context Improve dcumentation : application cannot use _ or ` (space) as they are relaced to_` by tailscale tooling and thus make tailscale failed to work

[juliamrch]

@Bencaddyro would you be up to take this issue?

[Bencaddyro]

😬 Not sure if i get enough bandwidth to do this right now Maybe it will be more suitable to let the one's that release it to document it (aka @StevenLeRoux )

[juliamrch]

@StevenLeRoux are you up for the challenge?

[StevenLeRoux]

@juliamrch You bet I am!