Few Fixes of Display (Feature Request)

I have been using AdminLte for a very long time. I observed a few issues which are quite irritating and very critical. Giving you some major examples:

• Not giving the proper position of "Brand Region": if you've defined a region please add that region into the block display too.
• If we Add more content scroll is not there. It gets stuck
  please add

  .content{
  overflow-Y: auto;
  overflow-X: hidden;
  height: 100vh;
  }

• If you're using your icons please add these to README because many users get confused with font-awesome icons since you added those too.

These are a few points.