Feature: add category icons

[maharsh9100]

Changes in this PR are as follows:

• Add custom icons to the title/category header#215
• Updates the services.yaml file
• Export the resolveIcon function into Utils for reusability

Note: One of the commit message is "Update setting.yaml mapping" which is incorrect while the commit on is fine.

[maharsh9100]

I'll work on resolving the conflicts.

[maharsh9100]

I have resolved all the merge conflicts. Really great project!!! 😃

[shamoon]

Thank you for the PR. I think some people may want this but this PR is a bit problematic imho as it alters the config schema i.e. it completely breaks an existing install's services...

At the very least it would need some kind of migration (not a good idea I think), otherwise I would consider a different way to do this, for example putting it in the layout map of the settings yaml or something like that. Even though the current way is 'cleaner', a complete breaking change just for this seems incongruous.

Also, code needs cleanup but I will hold off on that for now as the above is a 'show-stopper', again just IMHO.

[shamoon]

Have a look, I think its much simpler now to achieve this =)

settings.yaml:

layout:
  Home Management:
    icon: https://cdn-icons-png.flaticon.com/512/25/25694.png

Of course please let me know if you disagree

[shamoon]

Needs a squash, if merged.

[github-actions]

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