feat(explorer): As a user, I want the Subject Page title to be explicit

[alainncls]

What does this PR do?

Adds a title to the Subject Page
Adds a copyable address as subtitle

Related ticket

Fixes #815

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

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

[github-actions]

🚀 Deployed on https://6744a7e679613b289a20848a--resilient-starburst-d5d6d9.netlify.app

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.96%. Comparing base (3087119) to head (14c40a5).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #816   +/-   ##
=======================================
  Coverage   48.96%   48.96%           
=======================================
  Files          18       18           
  Lines         388      388           
  Branches       61       61           
=======================================
  Hits          190      190           
  Misses        195      195           
  Partials        3        3           

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