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

levels/intro/motivation

@@ -1,48 +0,0 @@
-[description]
-
-So you've been working on an essay about goldfish. You can look at the backup copies you made by clicking on them!
-
-But look - something went wrong in the latest version of the file! Maybe it has been infected with a vowel-eating virus?
-
-Make a new version (with the number 5) from the last version that's still okay, and add at least two more lines to it!
-
-[congrats]
-
-Good that you had that backup, huh?
-
-But you're a bit worried that two weeks from now, you'll have hundreds of copies of your essay, and it will be hard to keep track of all of them.
-
-And especially when working with other people, sending backup copies around doesn't seem ideal.
-
-Let's look at another way to do this. :) Click "Next Level" as soon as you're ready!
-
-[setup]
-
-rm -rf .git
-
-echo "~ Why goldfish are the best pets ~
-
-(I still need to write this.)" >> essay_1.txt
-
-
-echo "~ Why goldfish are the best pets ~
-
-- They don't make any noise.
-- They are pretty. (I should probably put this higher in the list?)" >> essay_2.txt
-
-
-echo "~ Why goldfish are the best pets ~
-
-- They are pretty.
-- They don't pee on the carpet.
-- They don't make any noise." >> essay_3.txt
-
-echo "~ Why gldfsh r th bst pts ~
-
-- Thy r prtty.
-- Thy dn't p n th crpt.
-- Thy dn't mk ny ns." >> essay_4.txt
-
-[win]
-
-test "$(cat *5.txt | wc -l )" -ge 7 && grep carpet *5.txt