DCJ-155: Move sign in button from the home page body to the navigation bar

[rushtong]

Addresses

https://broadworkbench.atlassian.net/browse/DCJ-155

Summary

Minor refactor of the sign in button placement from the body of the home page to the navigation bar. There are no functional differences - this is purely a button rearrangement. However, when the window size is reduced, this means that sign-in is now an element in the right-side panel whereas previously, it was hidden, so this PR adds a small degree of functionality.

Full Screen

The window on top is current dev, the window on the bottom is the new version.

Reduced Window Size

The window on the left is dev, the window on the right is new.

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[fboulnois]

looks good, on reduced sized screens we may want to have it as part of the navbar items instead of the bottom 👍

[okotsopoulos]

Looks good 👍