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/selene.toml

@@ -0,0 +1,8 @@
+std = "neovim"
+
+[rules]
+global_usage = "allow"
+if_same_then_else = "allow"
+incorrect_standard_library_use = "allow"
+mixed_table = "allow"
+multiple_statements = "allow"