fix: Login - Add padding between username / password

[bryphe-coder]

This is just a minor fit & finish fix for login, to more closely emulate the styling of v1.

Before:

After:

While I was looking at this - removed a few currently-unnecessary styles and added a story for this component.

[codecov]

Codecov Report

Merging #239 (df359af) into main (b6fcd81) will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   67.93%   68.24%   +0.31%     
==========================================
  Files         111      111              
  Lines        6003     6003              
  Branches       67       67              
==========================================
+ Hits         4078     4097      +19     
+ Misses       1531     1516      -15     
+ Partials      394      390       -4     

Flag	Coverage Δ
unittest-go-macos-latest	66.17% <ø> (?)
unittest-go-ubuntu-latest	67.40% <ø> (-0.04%)	⬇️
unittest-go-windows-latest	65.91% <ø> (+0.02%)	⬆️
unittest-js	64.76% <ø> (ø)

Impacted Files	Coverage Δ
site/components/SignIn/SignInForm.tsx	100.00% <ø> (ø)
peerbroker/dial.go	76.19% <0.00%> (-4.77%)	⬇️
database/pubsub.go	75.00% <0.00%> (-2.09%)	⬇️
peerbroker/listen.go	84.80% <0.00%> (+2.39%)	⬆️
peer/conn.go	79.74% <0.00%> (+5.64%)	⬆️

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