Prepare v0.7.0 releases

[daohoangson]

Related to #582

[github-actions]

Demo app

Deployed 775e007 to https://example-ak3lbgiof-flutter-widget-from-html.vercel.app.

Quick links:

• supported/tags.html
• Hello World
• Hello World (core)
• Wordpress
• --web-renderer canvaskit
• --web-renderer html

[codecov]

Codecov Report

Merging #583 (f1a4c34) into master (a2e7291) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #583   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files          54       54           
  Lines        3330     3330           
=======================================
  Hits         3275     3275           
  Misses         55       55           

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