Docs for beta release

[cgewecke]

Adds:

• Advanced Use
• Upgrade guide

Rewrites:

• README
• FAQ

Deletes:

• testrpc-sc publication docs

[codecov-io]

Codecov Report

Merging #415 into truffle-plugin will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           truffle-plugin     #415   +/-   ##
===============================================
  Coverage           99.06%   99.06%           
===============================================
  Files                  14       14           
  Lines                 639      639           
===============================================
  Hits                  633      633           
  Misses                  6        6

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