Add Git content up to git restore

I decided to convert the Git page into subpages. The downside is that
Just the Docs does not currently support more than 3 subpages deep.

I guess we'll have to wait for just-the-docs/just-the-docs#192 to be merged

docs/learn/unit7/command-line.md

@@ -144,6 +144,8 @@ You can use `..` in a relative path. Start in `src/com/omegarobotics`. For examp
 $ cd ../../..
 ```
 
+Note that `.` refers to the current directory.
+
 You should now be in the root directory of the U7 repo.
 
 To go to the home directory, use:

docs/learn/unit7/git.md

@@ -1,28 +0,0 @@
----
-layout: default
-title: Git
-permalink: learn/unit7/git
-parent: Unit 7
-grand_parent: Learn
-nav_order: 3
----
-
-<!-- prettier-ignore-start -->
-
-# Unit 7: Git
-{: .no_toc }
-
-Coming soon
-{: .label .label-yellow }
-
-## Table of Contents
-{: .no_toc .text-delta }
-
-1. TOC
-{:toc}
-
-<!-- prettier-ignore-end -->
-
-## Git
-
-## GitHub

docs/learn/unit7/git/branching.md

@@ -0,0 +1,21 @@
+---
+layout: default
+title: Branching
+permalink: learn/unit7/git/branching
+parent: Git
+grand_parent: Unit 7
+nav_order: 2
+---
+
+<!-- prettier-ignore-start -->
+
+# Unit 7: Git - Branching
+{: .no_toc }
+
+## Table of Contents
+{: .no_toc .text-delta }
+
+1. TOC
+{:toc}
+
+<!-- prettier-ignore-end -->

docs/learn/unit7/git/changes-to-code.md

@@ -0,0 +1,21 @@
+---
+layout: default
+title: Changes to Code
+permalink: learn/unit7/git/changes-to-code
+parent: Git
+grand_parent: Unit 7
+nav_order: 1
+---
+
+<!-- prettier-ignore-start -->
+
+# Unit 7: Git - Changes to Code
+{: .no_toc }
+
+## Table of Contents
+{: .no_toc .text-delta }
+
+1. TOC
+{:toc}
+
+<!-- prettier-ignore-end -->

docs/learn/unit7/git/fixing-mistakes-time-traveling.md

@@ -0,0 +1,21 @@
+---
+layout: default
+title: Fixing Mistakes/Time Traveling
+permalink: learn/unit7/git/fixing-mistakes-time-traveling
+parent: Git
+grand_parent: Unit 7
+nav_order: 4
+---
+
+<!-- prettier-ignore-start -->
+
+# Unit 7: Git - Fixing Mistakes/Time Traveling
+{: .no_toc }
+
+## Table of Contents
+{: .no_toc .text-delta }
+
+1. TOC
+{:toc}
+
+<!-- prettier-ignore-end -->