Fix #121 - Change default theme and layout from config

[Aryess]

Description

This PR adds default values in the config for the theme (dark/light/auto), and the layout (column/list). Respects the current default, if no config is changed, default will still be auto/column.

Fixes #121

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

[robinschneider]

I think it would be better to set the current values in code as default if they are not provided by the config file, so if anyone updates there homer and does not habe these set it will still work.

[Aryess]

Maybe I misunderstood you comment, but given the values are set in src/assets/defaults.yml, so even when updating existing installs, it shouldn't be an issue?

Happy to test this further if you want though

[Aryess]

@bastienwirtz sorry to be pushy but could you please have a look at this?

[Logicer16]

@bastienwirtz could you please take a minute to look at this. It would be a useful feature to have.

[Roundaround]

Looks good to me, thanks for your contribution!