Various Improvements

[HardeepAsrani]

Summary

• Rename Feed Categories to Feed Groups
• Add a filter to run_cron arguments
• Update feed and docs URL

Will affect visual aspect of the product

YES/NO

Test instructions

• Make sure Feed Category has been renamed to Feed Group everywhere.

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)

• Improve run_cron method #937
• Update the demo URL in the onboarding #1003
• Rename Feed Categories to Feed Groups #1012
• Incorrect Redirection of "Need Help" Button on Plugin Settings Screen #981

Also part of https://github.com/Codeinwp/feedzy-rss-feeds-pro/pull/793

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🎉 This PR is included in version 5.0.0 🎉

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