Better basic auth documentation

[javier]

Add a Basic Auth page under the authentication section.

Add info on the how to migrate from influx page to explain tokens and basic auth

[KanavCode]

Can I do this @javier ?
Please assign this issue to me with labels hacktoberfest2025, hacktoberfest-accepted

[javier]

Added you and the haktoberfest label. Thanks!

[ravi-hash]

Can I pick up this