0.0.5

- [X] Prepare backlog
- [X] Improve mode description header
- [X] Update version
- [X] Reorganize code for a better readability
  - [X] Reorganize var at the beginning of the buffer
  - [X] Add missing autoload property on psci function
  - [X] Remove dead code
  - [X] Reorganize private functions at the beginning of the buffer
  - [X] Improve psci minor mode's dosctring description
- [X] Add quit session command
- [X] Update documentation about quit command