This pr adds (config.js toggleable) showUV_Index to the hourly and
current weather modules, with right now only openmeteo configured to
supply the data. Other providers could have support too by adding
`uv_index` to current and hourly.
For example the current weather looks like

positioned after sunset in the top row.
The following "hacks" are included and could be fixed to make it
cleaner, but the functionality is wanted and it works without problem.
- To hide entries where the UV Index is 0 i added an if statement to the
`hourly.njk` which is not how precipitation is handled.
The following are minor things that might not need fixing:
- The forecast option does not have UV support. This might not be
relevant since UV changes throughout the day but i tried to implement a
"max_UV" to openmeteo.js, but am not confident enough in JS to
accomplish that.
- The UV Icon is wi-hot and manually added to the `.njk`'s. This could
be made changeable by a config but does not seem relevant since wi-hot
is not used by anything else as far as i can tell.
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Co-authored-by: veeck <michael@veeck.de>
1. Update `stylelint` dependencies
- As of stylelint v15, we do not need `stylelint-config-prettier`
anymore:
https://github.com/prettier/stylelint-config-prettier/releases/tag/v9.0.5
2. Switch to `stylelint-config-standard`:
`stylelint-prettier/recommended` has not been updated for a long time
and still needs the old `stylelint-config-prettier`
3. Handle new `stylelint` issues
They weren't applied to wrong classnames, this PR fixes that and also
expands the weather util tests
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Co-authored-by: veeck <michael@veeck.de>