Removed redundant information from readme

I found the read me a little confusing, so I've removed some parts that I thought were misleading or confusing:

1. Removed mention of neat-helpers and grid-settings (these are optional in neat, depending on how you use it - better to let the neat readme explain that?)
2. Removed duplicate explanation of how to use refillls (copy/paste code explanation was under both installing dependencies and using refills sections)