add umami .http getters

[boly38]

In order to understand or manually test Umami API, we could use IntelliJ http client to produce and test API

• Umami API doc: https://umami.is/docs/authentication

add some sample for auth+get websites at least

[boly38]

Some doc issue found:

• auth - ok
• users - GET : 405
• teams or websites - GET

{
  "data": [],
  "count": 0,
  "page": 1,
  "pageSize": 10,
  "orderBy": "name"
}

=> data level not reported in umami doc

• in https://umami.is/docs/website-stats
• • error in first : /active uses /stats as example
• • o details on /stats

==> next : umami-software/website#150