Update "About" menu with new info

USE CASE: WHAT DO YOU WANT TO DO?

Update the "About" menu

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

Help > About

CURRENT BEHAVIOR

2 links are provided: home page and announcement. Both are TextBoxes and have buttons next to them.

EXPECTED BEHAVIOR

Show them as links, instead of TextBoxes + Buttons.
Homepage should be the link to the bitbucket home page https://bitbucket.org/TreeView3Dev/treeview3/
Announcements: is there way to have a page on MailChimp with the subscription? if there is, we can point to that page both from here and from the README on the bitbucket homepage. I would like to keep everything (code + documentation + info + announcements) as centralized as possible.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

e.g. Add a color selection class

FILES AFFECTED (where the changes will be implemented) - developers only

e.g. selectColor.java & settingsPanel.java

LEVEL OF EFFORT - developers only

trivial/minor/medium/major/overhaul (choose one)

COMMENTS

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