fix: font styling and small ux bugs

[KristinAoki]

JIRA Ticket: TNL-11149

• Not enough spacing above and below heading
• Add space below alert component
• Fields should be spaced farther apart
• Error text should match Figma
• Remove “x” from error text
• Cancel and create buttons should be right aligned
• Fields and buttons should be inside of a card
• Menu should say “No results found” instead of “No options”

Before

After

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (fbdc822) 52.39% compared to head (e41267a) 52.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
+ Coverage   52.39%   52.41%   +0.02%     
==========================================
  Files          75       75              
  Lines        1983     1986       +3     
  Branches      359      359              
==========================================
+ Hits         1039     1041       +2     
- Misses        911      912       +1     
  Partials       33       33              

Files	Coverage Δ
src/library-authoring/common/FormGroup.jsx	94.11% <100.00%> (ø)
...ary-authoring/create-library/LibraryCreatePage.jsx	79.68% <100.00%> (+1.56%)	⬆️
src/library-authoring/create-library/messages.js	100.00% <ø> (ø)
src/library-authoring/create-library/data/slice.js	14.28% <0.00%> (-1.72%)	⬇️

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