modify basic filestructure

It's unclear what's 'basic', so `basic/` notes have been mostly moved.
The remainder became `shell/`.

shell/games.md

@@ -0,0 +1,11 @@
+---
+title: "bash games"
+tags: [ "fun" ]
+---
+
+Games are a great way to learn bash.
+
+- `mapscii.me` is an interactive terminal map.
+    1. Install telnet.
+    1. `telnet mapscii.me`
+- [Over the Wire](https://overthewire.org/wargames) teaches bash with small challenging you can do over `ssh`.