Preview release

I think the Prototype is done, as now we can use rustybrain to build our second brain locally with Markdown.

• Editor with basic Markdown support.
• Repository management to load and save notes, builtin index to support search.
• Shortcuts to boost workflow, connecting notes together easily.
  • Control + Shift + f to find a note from rustybrain repository.
  • Control + I to insert a note to current note.
• Backlinks to bind notes together.