grails-gradle API Docs

[jamesfredley]

Issue description

Prior to consolidation api docs were located: https://apache.github.io/grails-gradle-plugin/latest/api/ & https://github.com/apache/grails-doc/tree/gh-pages/latest/api

Locations to Update with new URL:

• https://github.com/apache/grails-core/tree/7.0.x/grails-gradle/plugins#readme

Errors in .\guide\conf.html

• [ERROR] </grails-core/grails-doc/build/docs/api/grails/util/Environment.html> | Cannot find file

Errors in .\guide\plugins.html

• [ERROR] </grails-core/grails-doc/build/docs/api/grails/util/BuildScope.html> | Cannot find file

Errors in .\guide\single.html

• [ERROR] </grails-core/grails-doc/build/docs/api/grails/util/BuildScope.html> | Cannot find file
• [ERROR] </grails-core/grails-doc/build/docs/api/grails/util/Environment.html> | Cannot find file