WD-12072 - docs: candid docs

[huwshimi]

Done

• add instructions for setting up Juju with Candid

QA

• Follow the instructions in the doc and check that you can log in to the dashboard.

Details

https://warthogs.atlassian.net/browse/WD-12072

[webteam-app]

Demo

Jenkins

demos.haus

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.19%. Comparing base (c83fe90) to head (1a57808). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1773 +/- ## ========================================== + Coverage 96.94% 97.19% +0.24% ========================================== Files 418 422 +4 Lines 23160 23220 +60 Branches 2934 2950 +16 ========================================== + Hits 22453 22569 +116 + Misses 707 651 -56 ```

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