chore(contracts): Document the deployment of a new Verax instance

[alainncls]

What does this PR do?

• Improves the Contracts documentation
• Better describes the deployment process

Related ticket

Fixes #854

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.01%. Comparing base (6a6a9aa) to head (27e2882).

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #855       +/-   ##
===========================================
+ Coverage   48.59%   79.01%   +30.42%     
===========================================
  Files          18       51       +33     
  Lines         391     1101      +710     
  Branches       63      183      +120     
===========================================
+ Hits          190      870      +680     
- Misses        198      228       +30     
  Partials        3        3               

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