Remove duplicate .pre-commit-*.yml files (#1089)

Identical .yaml copies are still in place.

Before:
> # ls -1 .pre-commit-*.y*
> .pre-commit-config.yaml
> .pre-commit-config.yml
> .pre-commit-hooks.yaml
> .pre-commit-hooks.yml

After:
> # ls -1 .pre-commit-*.y*
> .pre-commit-config.yaml
> .pre-commit-hooks.yaml
diff --git a/.pre-commit-config.yml b/.pre-commit-config.yml
deleted file mode 100644
index 3bd65c2..0000000
--- a/.pre-commit-config.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-# File introduces automated checks triggered on git events
-# to enable run `pip install pre-commit && pre-commit install`
-
-repos:
-  - repo: local
-    hooks:
-      - id: yapf
-        name: yapf
-        language: python
-        entry: yapf
-        args: [-i, -vv]
-        types: [python]
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.2.0
-    hooks:
-      - id: trailing-whitespace
-      - id: check-docstring-first
-      - id: check-json
-      - id: check-added-large-files
-      - id: check-yaml
-      - id: debug-statements
-      - id: requirements-txt-fixer
-      - id: check-merge-conflict
-      - id: double-quote-string-fixer
-      - id: end-of-file-fixer
-      - id: sort-simple-yaml
-  - repo: meta
-    hooks:
-      - id: check-hooks-apply
-      - id: check-useless-excludes
diff --git a/.pre-commit-hooks.yml b/.pre-commit-hooks.yml
deleted file mode 100644
index 3eba1f2..0000000
--- a/.pre-commit-hooks.yml
+++ /dev/null
@@ -1,9 +0,0 @@
-# File configures YAPF to be used as a git hook with https://github.com/pre-commit/pre-commit
-
-- id: yapf
-  name: yapf
-  description: "A formatter for Python files."
-  entry: yapf
-  args: [-i] #inplace
-  language: python
-  types: [python]