* Make sure user-defined themes folders exist in the data path
* Minor cleanup in shortcuts table
* Add details in docs on how to customise GUI and add dictionaries
* Add spell check reference in docs overview
* Change documentation theme to 'furo'
* Update docs source for new theme
* Update index and split introduction
* Add a Getting Started section to the docs
* Rename getting started docs file
* Reorganise setup instructions
* Update usage sections for consistency
* Update docs references in main README
* Show release in sidebar