Fix spacing and reactions alignment in Keystone/Boilerplate

[igraziatto]

Closes https://github.com/vanilla/themes/issues/267
Closes #8296
Closes https://github.com/vanilla/support/issues/312
Closes https://github.com/vanilla/support/issues/1371
Closes #9391

[codecov]

Codecov Report

Merging #10029 into master will decrease coverage by 24.44%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master   #10029       +/-   ##
=============================================
- Coverage     52.51%   28.06%   -24.45%     
+ Complexity     7854     4834     -3020     
=============================================
  Files           367      170      -197     
  Lines         43934    32189    -11745     
=============================================
- Hits          23070     9034    -14036     
- Misses        20864    23155     +2291

Impacted Files	Coverage Δ	Complexity Δ
library/Vanilla/Formatting/Quill/Renderer.php	0% <0%> (-100%)	0% <0%> (ø)
...ry/Vanilla/Authenticator/PasswordAuthenticator.php	0% <0%> (-100%)	11% <0%> (ø)
library/Garden/StaticCacheConfigTrait.php	0% <0%> (-100%)	0% <0%> (ø)
...ions/dashboard/library/class.staticinitializer.php	0% <0%> (-100%)	2% <0%> (ø)
library/Garden/StaticCacheTranslationTrait.php	0% <0%> (-100%)	0% <0%> (ø)
library/Vanilla/Utility/CapitalCaseScheme.php	0% <0%> (-100%)	1% <0%> (ø)
library/Vanilla/Site/DefaultSiteSection.php	0% <0%> (-100%)	8% <0%> (+1%)
library/Vanilla/AliasLoader.php	0% <0%> (-100%)	0% <0%> (ø)
library/Garden/MetaTrait.php	0% <0%> (-96.88%)	14% <0%> (ø)
library/Vanilla/Web/TwigRenderTrait.php	0% <0%> (-95.66%)	0% <0%> (ø)
... and 305 more

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[blutarch]

Verified visually on localhost that all the linked issues are resolved by the PR.