Incorrect Screenshots in user docs

[msherman64]

@tuxrenci reported the following:

Screenshots at https://chameleoncloud.readthedocs.io/en/latest/technical/gui.html#gui-features are out of date.

In particular, the placement of the api_access menu item, and the lack of "themes" in the drop-down menu.

vs

and

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also, presence of search bar for floating-ips

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[BNNARAJ]

Hello @msherman64
As per the issue posted and provided screenshots are updated in the PR #115 . I am looking forward to your reply after reviewing.