docs: improve README with icon, full inputs, and About Pipery section

[hbahadorzadeh]

Updates the README with:

• Action icon (Feather icon matching the action branding) in the title
• Short description of what the action does
• Full inputs table with all available inputs and defaults
• About Pipery section with the Pipery zap icon explaining psh and the ecosystem
• Links to the Pipery Dashboard, Marketplace, and source

[gemini-code-assist]

Code Review

This pull request significantly updates the README.md to provide a more comprehensive overview of the Pipery Python CI action, including a detailed pipeline steps table, an expanded list of inputs, and a new section about the Pipery platform. Feedback suggests adding the missing target_branch input to the documentation and restoring the Outputs section to include the version output.

[gemini-code-assist]

The target_branch input is missing from the inputs table. Since this section is intended to be a comprehensive list of all available inputs, it should include this configuration option, especially as it is a key parameter for the reintegration step.

Suggested change

	| `github_token` | `` | GitHub token for reintegration. |
	| `github_token` | `` | GitHub token for reintegration. |
	| `target_branch` | `main` | Target branch for reintegration. |

[gemini-code-assist]

The action defines a version output in action.yml, but the documentation for outputs was removed in this update. It is recommended to include an "Outputs" section to inform users about the data available for use in subsequent steps of their workflow.

Suggested change

	## Outputs
	| Name | Description |
	|---|---|
	| `version` | The new version string after the versioning step. |