0.0.8

- [X] Create backlog
- [X] Update version
- [X] Fix implementation of output-directory function
- [X] Remove unused dependency deferred (for the moment not used)
- [X] Improve doc (header + README.org + customization group + install step)
- [X] Create minor mode with default bindings
- [X] Update readme about minor mode
- [X] Add TOC to readme