config(nvim): add AstroNvim config; font: VictorMono NF via packages

nvim added static from live home; vendored .git/tool-state dirs removed
and ignore-gated against re-add. ttf-victor-mono-nerd (arch) and
font-victor-mono-nerd-font cask (darwin) added to packages manifest.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dot_config/nvim/README.md

@@ -0,0 +1,34 @@
+# AstroNvim Template
+
+**NOTE:** This is for AstroNvim v6+
+
+A template for getting started with [AstroNvim](https://github.com/AstroNvim/AstroNvim)
+
+## 🛠️ Installation
+
+#### Make a backup of your current nvim and shared folder
+
+```shell
+mv ~/.config/nvim ~/.config/nvim.bak
+mv ~/.local/share/nvim ~/.local/share/nvim.bak
+mv ~/.local/state/nvim ~/.local/state/nvim.bak
+mv ~/.cache/nvim ~/.cache/nvim.bak
+```
+
+#### Create a new user repository from this template
+
+Press the "Use this template" button above to create a new repository to store your user configuration.
+
+You can also just clone this repository directly if you do not want to track your user configuration in GitHub.
+
+#### Clone the repository
+
+```shell
+git clone https://github.com/<your_user>/<your_repository> ~/.config/nvim
+```
+
+#### Start Neovim
+
+```shell
+nvim
+```