Moving from sphinx to mkdocs

docs/overview.md

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+# Overview
+
+## What is jrnl?
+
+`jrnl` is a simple journal application for
+your command line. Journals are stored as human readable plain text
+files - you can put them into a Dropbox folder for instant syncing and
+you can be assured that your journal will still be readable in 2050,
+when all your fancy iPad journal applications will long be forgotten.
+
+`jrnl` also plays nice with the fabulous
+[DayOne](http://dayoneapp.com) and can read and write directly from and
+to DayOne Journals.
+
+Optionally, your journal can be encrypted using the [256-bit
+AES](http://en.wikipedia.org/wiki/Advanced_Encryption_Standard).
+
+## Why keep a journal?
+
+Journals aren't just for angsty teenagers and people who have too much
+time on their summer vacation. A journal helps you to keep track of the
+things you get done and how you did them. Your imagination may be
+limitless, but your memory isn't.
+
+For personal use, make it a good habit to write at least 20 words a day.
+Just to reflect what made this day special, why you haven't wasted it.
+
+For professional use, consider a text-based journal to be the perfect
+complement to your GTD todo list - a documentation of what and how
+you've done it. Or use it as a quick way to keep a change log. Or use it
+to keep a lab book.