chore: redo addons page content

[HardeepAsrani]

Summary

This PR updates Addons page, and makes few changes:

• Removes separate Field cards and replaces them with a single card outlining all the field types.
• Redoes the description of Addons, and adds Docs link where I could find them.
• Removes Get Starter link for Pro users.

Will affect visual aspect of the product

YES

Screenshots

Test instructions

• Make sure the content is relevant.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/ppom-pro/issues/388.

[pirate-bot]

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[selul]

@HardeepAsrani great 🚀

[pirate-bot]

🎉 This PR is included in version 33.0.0 🎉

The release is available on GitHub release

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