API-36891 Update login page (#495)

* intial changes

* more changes to ux

* changes to align icons

* fixing seperators

* adjusting margins

* renaming image

* revert package json changes

* adjusting button width

* use formation classes

* add custom classes from vagov

* update formation

* add border color

* resize title

* cleanup

* bold override

* add color vars

* use new button classes

* use existing login bot button names

* update tests

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Co-authored-by: John Weisz <[email protected]>