spellcheck: Check spelling for dotfiles

Typos counts these as 'hidden', even if they are tracked in git (like .gitignore)
Enabling this means we need to explicitly exclude the  '.git' directory

Fix spelling in .gitignore

Author: Techcable

.gitignore

@@ -21,7 +21,7 @@ __pycache__
 /uv.lock
 
 ##
-## Miscelaneous
+## Miscellaneous
 ##
 /build
 /target

_typos.toml

@@ -1,3 +1,9 @@
+[files]
+ignore-hidden = false  # we want dotfiles
+extend-exclude = [
+    ".git", # needed because we 'ignore-hidden'
+]
+
 [default.extend-words]
 # Pydantic uses 'ser' as a shorthand for 'serialize'
 # See issue crate-ci/typos#1318