docs(previews): update wp-admin doc links, add actions-and-filters doc

[ahuseyn]

Description

This pull request updates the documentation links shown in the WordPress admin for the HWP Previews plugin and improves the organization of the documentation files. The main changes include updating link destinations to point to the new documentation structure and renaming the actions and filters documentation file for clarity.

Documentation improvements:

• Updated the documentation links in the admin template (admin.php) to point to the new locations in the docs/plugins/hwp-previews directory, including new guides and tutorials.
• Added new links for "Configure Previews", "Core Concepts", "Build Previews with Next.js and WPGraphQL", and "Build Previews with Next.js and REST API" to the admin documentation section.
• Changed the "Actions and Filters" link in the admin to reference the renamed and relocated documentation file.

Documentation file organization:

• Renamed ACTIONS_AND_FILTERS.md to explanation/actions-and-filters/index.md and added frontmatter for improved clarity and integration with the documentation system.
• Updated the content and formatting of the actions and filters documentation to match the new documentation standards.

Other:

• Added a changeset entry to document the update to documentation links on wp-admin.

Related Issue

• chore(previews): Add references to the new docs #508

Dependant PRs

Type of Change

• ✅ Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactoring (no functional changes)
• 📄 Example update (no functional changes)
• 📝 Documentation update
• 🔍 Performance improvement
• 🧪 Test update

How Has This Been Tested?

Screenshots

Checklist

• I have read the CONTRIBUTING document
• My code follows the project's coding standards
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• Any dependent changes have been highlighted, merged or published

[changeset-bot]

🦋 Changeset detected

Latest commit: 0dff8ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@wpengine/hwp-previews-wordpress-plugin	Patch

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[github-actions]

📦 Plugin Artifacts Ready!

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Available plugins:

• ✅ hwp-previews.zip

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