Anchors can come from additional WYSIWYG fields included inside
associated DataObjects. Don't assume all anchor links on the page are in
this one field.
Warnings are triggered when:
* Changing the URL Segment
* Unpublishing
* Unpublishing & Archiving
* Moving the homepage to another parent in the tree view
Also add `SiteTree->isHomePage()`
When editing a page an author may insert anchors into their content (via
TinyMCE), and wish to link to those anchors from another point in that
page. E.g. creating a table of contents, a "jump to top" link at the
base of the content, etc.
Previously this required the page to first be saved as a draft, then
reloaded before the anchors would show in the list to link to. Now they
are dynamically pulled from the content entered for a more fluid editing
experience.
* NEW Add revert mutation and refactor injector transformations
Removing the existing HOC component and just using Injector transformations to apply the GraphQL query and mutation
* Refetch versions after performing the revert mutation
* WIP Provide additional context
