Rename "intro" to "high-level" and "internals" to "low-level"

levels/high-level/setup

@@ -0,0 +1,31 @@
+[description]
+
+One month later, you're woking on an essay about tardigrades!
+
+This time, a friend has recommended that you use the version control system Git to keep backups of your file.
+
+Currently, your directory only contains your essay. To initialize a Git repository in your directory, type:
+
+    git init
+
+Then, each time you want to make a backup, type:
+
+    git add essay.txt
+    git commit
+
+Enter a description of what you changed in the editor that opens and click save.
+
+That way, you've made a backup of the current version of the file. Then add at least two more lines, and make another backup by repeating the add and the commit commands.
+
+[setup]
+
+rm -rf .git
+
+echo "~ Why tardigrades are cool ~
+
+- They can survive in space.
+- They are resistant to extreme heat and cold." > essay.txt
+
+[win]
+
+test -d .git && git rev-parse HEAD^ && test "$(git show HEAD:essay.txt | wc -l)" -ge 6