* Update plugin docs

* Updated plugins installation documentation

Moved all Grafana CLI commands into cli.md, moved API script into user.md, rewrote installation.md as an actual task that refers the user to the plugins installation page

* Update cli.md

* Update cli.md

* Update docs/sources/administration/cli.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/administration/cli.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/http_api/user.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/http_api/user.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update cli.md

* Fixed links

* Update cli.md

* Update cli.md

* Update cli.md

* Update cli.md

Co-authored-by: Dan Cech <dan@aussiedan.com>