Reformatted the README

* Neatly combined all project badges and introductory links under the AGM logo.
* Removed the “Get Latest Version” link — seems redundant, as that page is already accessible via the common GitHub interface (top bar) and through a prominent badge.
* Moved the donation button down to the bottom of page, so as not to appear needy — the good people who seek it, will find it anywhere, but for other visitors it's a distraction from the main content and presentation.
* Fixed some minor [typos and wording](https://www.youtube.com/watch?v=ZPpdSzyDtL0).