Lyrics-in-terminal

* Added post install script to add new config options without overwriting previous config options.
* Added configurable `edit` lyrics option

* Added option to edit/add lyrics
Press <kbd>e</kbd> and `$EDITOR` (nano by default) wiill open lyrics file.

* Added Error handler
No more weird curses errors in terminal when application is quit with `SIGTERM` or resized into a small window

- Added help page to show keybindings and default options, just press `h`.

- Changed config file location to `~/.config/lyrics-in-terminal/lyrics.cfg`
Now updating or reinstalling the package will not overwrite config file.

Added config file support.

Now user can set default options and custom keybindings.

Config file location ~/.local/lib/python3.x/site-packages/lyrics/lyrics.cfg