docs(push): restore push action buttons README section

[evan-masseau]

Description

Restore the "Push Action Buttons" README section ahead of the 4.4.0 release. The section was previously added in #410 then reverted in 5e82562 to keep master clean while the feature soaked on the release branch. Wording is aligned with the parallel RN SDK README update (klaviyo/klaviyo-react-native-sdk#309) for cross-platform consistency — uses "provide the ability", "A notification can include up to 3 buttons", and "No additional SDK setup is required".

Due Diligence

• I have tested this on an emulator and/or a physical device. (N/A — doc-only)
• I have added sufficient unit/integration tests of my changes. (N/A — doc-only)
• I have adjusted or added new test cases to team test docs, if applicable. (N/A — doc-only)
• I am confident these changes are compatible with all Android versions the SDK currently supports. (N/A — doc-only)

Release/Versioning Considerations

• Patch Contains internal changes or backwards-compatible bug fixes.
• Minor Contains changes to the public API.
• Major Contains breaking changes.
• Contains readme or migration guide changes.
  • Targeting rel/4.4.0 so the docs go live with the 4.4.0 release.
• This is planned work for an upcoming release.

Changelog / Code Overview

• README.md: restored the "Push Action Buttons" section (6 lines) covering the feature surface added in Feat/push action buttons #440 / fix(push): dismiss notification on action button tap #442.
• Wording matches RN SDK README PR Bump version number to 4.0.1 (#307) #309 to keep the platform docs consistent.
• No code changes — pure documentation.

Test Plan

• Render README.md locally / on GitHub and confirm the new section renders correctly under the push notifications area.

Related Issues/Tickets

• Original Android README addition: update README for push action buttons #410 (by @ab1470)
• Revert that this restores: 5e82562
• Parallel RN SDK README update: push action button readme update klaviyo-react-native-sdk#309

[evan-masseau]

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