Add Mkdocs

docs/getting_started.md

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+# Get Started
+
+1. Install [the recommended font](font.md). *Optional but highly
+   recommended.*
+2. Install Powerlevel10k for your plugin manager.
+   - [Manual](#manual) 👈 **choose this if confused or uncertain**
+   - [Oh My Zsh](#oh-my-zsh)
+   - [Prezto](#prezto)
+   - [Zim](#zim)
+   - [Antibody](#antibody)
+   - [Antigen](#antigen)
+   - [Zplug](#zplug)
+   - [Zgen](#zgen)
+   - [Zplugin](#zplugin)
+   - [Zinit](#zinit)
+   - [Homebrew](#homebrew)
+   - [Arch Linux](#arch-linux)
+3. Restart Zsh.
+4. Type `p10k configure` if the configuration wizard doesn't start automatically.