style: pre-commit cleanup (#3111)

* style: disallow PyTest (should be pytest)

* style: cleanup spell checking a bit

* style: add a few items to the .gitignore

.pre-commit-config.yaml

@@ -92,12 +92,8 @@ repos:
   rev: v2.1.0
   hooks:
   - id: codespell
-    name: codespell
-    description: Checks for common misspellings in text files.
-    entry: codespell
-    language: python
-    types: [text]
-    args: ["-q", "3", "--skip", "*.supp", "-L", "nd,ot,thist,readded"]
+    exclude: ".supp$"
+    args: ["-L", "nd,ot,thist"]
 
 # The original pybind11 checks for a few C++ style items
 - repo: local
@@ -105,7 +101,7 @@ repos:
   - id: disallow-caps
     name: Disallow improper capitalization
     language: pygrep
-    entry: PyBind|Numpy|Cmake|CCache
+    entry: PyBind|Numpy|Cmake|CCache|PyTest
     exclude: .pre-commit-config.yaml
 
 - repo: local