Add HOT Browser Icon

[mataharimhairi]

Add the HOT favicon/browser icon to the Visualize Change (http://visualize-change.hotosm.org) page, like the HOT Tasking Manager and HOT Export Tool has:

[soulspark666]

I'll do something about it.

[soulspark666]

In which branch PR should be sent?

[r-i-c-h]

@soulspark666 - [Not my repo, but normally, for every feature there is its own branch, even if you are working off of your own fork]

[dakotabenjamin]

@soulspark666 send to develop please.