feat: doc + slight display improvements

[quentinderoubaix]

• added some paragraphs for the samples
• resizable observer now observes the root element instead of the body
• slight display improvements on the alert icon + pagination sample for 400px (requirement for full accessibility)

[codecov]

Codecov Report

Merging #82 (a458de4) into main (44be31d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   94.00%   94.00%           
=======================================
  Files          69       69           
  Lines        5237     5237           
  Branches      460      460           
=======================================
  Hits         4923     4923           
  Misses        267      267           
  Partials       47       47           

Flag	Coverage Δ
e2e-1	65.06% <ø> (ø)
e2e-2	18.16% <ø> (ø)
e2e-4	73.80% <ø> (ø)
e2e-5	47.61% <ø> (ø)
e2e-7	52.61% <ø> (ø)
e2e-8	31.04% <ø> (ø)
unit	98.95% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
angular/lib/src/lib/alert/alert.component.ts	90.90% <ø> (ø)
core/lib/alert.ts	98.95% <100.00%> (ø)

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[quentinderoubaix]

thanks for the review @ExFlo !

[divdavem]

@quentinderoubaix Why did you remove the service worker?
Now, because of this, browsers that visited the site before the removal of the service worker are now always showing the old version of the site.
I am adding it back in #97.