Documentation update for the WP plugin related to the install directory & name prop

[bmarshall511]

Description of the Change

Updated the wordpress-plugin.md to make it clear what needs to be updated to avoid the plugin being installed in the vendor directory and prevent the name prop error related to missing a vendor prefix.

Closes #521

How to test the Change

1. On a fresh WP install, in terminal, navigate to the wp-content directory
2. Run composer require headstartwp/headstartwp
3. Update the composer.json file as directed in the updated wordpress-plugin.md in this PR
4. Run composer update then composer install

Changelog Entry

Fixed - Documentation update for the WP plugin related to the install directory & name prop

Credits

Props @bmarshall511

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.

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Name	Status	Preview	Updated (UTC)
headstarwp	✅ Ready (Inspect)	Visit Preview	Jun 16, 2023 3:31pm

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