Move error message and adjust design on login page

[swaterkamp]

What:
Move error message and adjust design on login page

Why:
To further unify the login page designs

How:
Visual inspection. Automatic tests are still passing.

Checklist:

• [N/A] Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2780 (1168c37) into gsa-21.04 (34466a4) will increase coverage by 0.14%.
The diff coverage is 98.03%.

@@              Coverage Diff              @@
##           gsa-21.04    #2780      +/-   ##
=============================================
+ Coverage      53.71%   53.86%   +0.14%     
=============================================
  Files           1072     1075       +3     
  Lines          26223    26208      -15     
  Branches        7474     7476       +2     
=============================================
+ Hits           14086    14116      +30     
+ Misses         11019    10976      -43     
+ Partials        1118     1116       -2     

Impacted Files	Coverage Δ
gsa/src/gmp/cancel.js	100.00% <ø> (ø)
gsa/src/gmp/capabilities/capabilities.js	100.00% <ø> (ø)
gsa/src/gmp/capabilities/everything.js	100.00% <ø> (ø)
gsa/src/gmp/collection/collectioncounts.js	82.60% <ø> (ø)
gsa/src/gmp/collection/parser.js	61.70% <ø> (ø)
gsa/src/gmp/command.js	100.00% <ø> (ø)
gsa/src/gmp/commands/alerts.js	14.28% <ø> (ø)
gsa/src/gmp/commands/audits.js	52.45% <ø> (ø)
gsa/src/gmp/commands/auth.js	100.00% <ø> (ø)
gsa/src/gmp/commands/certbund.js	63.63% <ø> (ø)
... and 261 more

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