docs: css and events documentation

[jboix]

Description

Update the API documentation to include CSS initialisation instructions and the events of the playlist plugin,

Changes Made

• Adds instructions on how to include the CSS for each package.
• Updates the README template so that future package also include a CSS section.
• Adds API documentation for the playlist's events.

Checklist

• [x] I have followed the project's style and contribution guidelines.
• [x] I have performed a self-review of my own changes.
• [x] I have made corresponding changes to the documentation.
• [x] I have added tests that prove my fix is effective or that my feature works.

[github-actions[bot]]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	93.81%	850 / 906
🔵	Statements	93.81%	850 / 906
🔵	Functions	93.75%	60 / 64
🔵	Branches	92.3%	84 / 91

File Coverage

No changed files found.

Generated in workflow #55

[github-actions[bot]]

PR Preview Action v1.4.7 :---: Preview removed because the pull request was closed. 2024-06-06 14:01 UTC

[github-actions[bot]]

:tada: This PR is included in version @srgssr/pillarbox-playlist-v1.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version @srgssr/skip-button-v1.0.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: