v0.1.33

This is effectively a second pre-release of 1.0.0, which will be shipped with no additional features after I’ve spent some time testing this release.

Images and files dragged into the editor or added to an image-type frontmatter field now default to relative paths. This can be overridden to use absolute paths (relative to the project root) on a per-project and per-collection basis.
Extensive refactoring under the hood.