Release 0.2.2

[KamilSztandur]

Version bump to 0.2.2 and the changelog for what has been merged since 0.2.1+1.

In this release

• Conditional sections in one line: addSubform(invoice, enabled: () => …) attaches and detaches the section as the value flips, and its values survive (A conditional section in one line #91).
• setOptions on both select controllers, so a dropdown can depend on another field or on a server response (Let the options of a select change while the form is open #89).
• The agent skill is a Dart package skill installed with dart run skills@ get; the copy button and /skill.md stay for reading it first (Agent skill: Improve visibility on landing website and install it in one copy-paste #86, Install the agent skill with one command: dart run skills@ get #92).
• Docs on making a prefilled field react to another field before the user touches it (Explain how a prefilled field can react to another field before the user touches it #90).
• The new logo across the website, favicon and README (The new logo, everywhere #84, README banner: the new mark in the tile #85).

flutter analyze clean, all 286 tests pass.

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