Password Protection For Web UI

[techcat-dev]

Is there any way to add password protection for the Web UI? From what I understand, anyone that knows the IP address and port number of the Bjorn device can access the entire Web UI. which would be a major security concern.

I would also like it if there was text put underneath the UI buttons describing what the menu is about. since I find the images to be a little bit confusing and too vague.

[EricGoldsteinNz]

Added this as a PR here:
#75