move xdg directories to the default location.

a lot of applications seem to hardcode this location, so it's better to
have something default, or default-adjasoned.

.config/nvim/spell/user.utf-8.add

@@ -0,0 +1,56 @@
+binary-formatted
+calc
+config
+const
+double-precision
+editorconfig
+entry-point
+github
+gitignore
+gitlab
+half-precision
+if
+init
+inputted
+JSON
+keymap
+LLM
+lsp
+malloc'd
+neovim
+non-zero
+null-terminated
+numlock
+nvidia
+nvidia-settings
+nvim-cmp
+OR'd
+overworld
+parsable
+Quinn
+re-enable
+regex
+res
+SDL
+shader
+shaders
+single-precision
+startup
+stderr
+stdout
+system-wide
+TODO
+undefine
+whitespace
+ˣ
+xorg
+zero-initialise
+zero-out
+θ
+π
+τ
+φ
+ψ
+timestamp
+tetromino
+μs