Add block icons

[ekdahl]

Suggestion for #5119. If solution is ok, icons can added for other blocks in this PR.

Results in block icon on the left and settings icon on the right:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 35.58%. Comparing base (f2eadec) to head (2de9189).

Files with missing lines	Patch %	Lines
app/Module/OnThisDayModule.php	0.00%	1 Missing ⚠️
app/Module/UserFavoritesModule.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5120      +/-   ##
============================================
- Coverage     35.58%   35.58%   -0.01%     
  Complexity    11142    11142              
============================================
  Files          1157     1157              
  Lines         47739    47741       +2     
============================================
  Hits          16988    16988              
- Misses        30751    30753       +2     

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[fisharebest]

There are two changes here:

1. Moving the "configure" icon to the right
2. Adding icons to the title

I think the first looks good. I would prefer class="d-flex justify-content-between" to float: end.
I think it would look better if the title is long an wraps onto two lines.

I'm not sure about the second change. Maybe if we had icons for more/all of the blocks? It seems odd to have them for just a few blocks.

[ekdahl]

1. Ok, will update
2. Yes, that's why it's only a draft PR, just selected a few blocks to get feedback for the concept before doing more changes.

[ekdahl]

I think the first looks good. I would prefer class="d-flex justify-content-between"

A question regarding this. Wouldn't that make the title centered instead of directly after the icon at the left side?

[ekdahl]

Made an attempt to use d-flex instead. Looks like this:

Not so good for colors unfortunately