Add .pre-commit-config.yaml and .prettierignore

.pre-commit-config.yaml

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+# pre-commit is a tool to perform a predefined set of tasks manually and/or
+# automatically before git commits are made.
+#
+# Config reference: https://pre-commit.com/#pre-commit-configyaml---top-level
+#
+# Common tasks
+#
+# - Run on all files:   pre-commit run --all-files
+# - Register git hooks: pre-commit install --install-hooks
+#
+repos:
+  # FIXME: Autoformatting of our .py files by pyupgrade/autoflake/isort/black is
+  #        initially not enabled as it would lead to large indentation changes
+  #        while we currently have several open PRs good to resolve first.
+  #
+
+  # # Autoformat: Python code, syntax patterns are modernized
+  # - repo: https://github.com/asottile/pyupgrade
+  #   rev: v3.3.1
+  #   hooks:
+  #     - id: pyupgrade
+  #       args:
+  #         - --py37-plus
+
+  # # Autoformat: Python code
+  # - repo: https://github.com/PyCQA/autoflake
+  #   rev: v2.0.0
+  #   hooks:
+  #     - id: autoflake
+  #       # args ref: https://github.com/PyCQA/autoflake#advanced-usage
+  #       args:
+  #         - --in-place
+
+  # # Autoformat: Python code
+  # - repo: https://github.com/pycqa/isort
+  #   rev: 5.11.4
+  #   hooks:
+  #     - id: isort
+
+  # # Autoformat: Python code
+  # - repo: https://github.com/psf/black
+  #   rev: 22.12.0
+  #   hooks:
+  #     - id: black
+
+  # Autoformat: markdown, yaml, javascript (see the file .prettierignore)
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v3.0.0-alpha.4
+    hooks:
+      - id: prettier
+        # FIXME: Autoformatting of our .js files is initially not enabled as it
+        #        would lead to large indentation changes while we currently have
+        #        several open PRs good to resolve first.
+        exclude_types:
+          - "javascript"
+
+  # Autoformat and linting, misc. details
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: requirements-txt-fixer
+      - id: check-case-conflict
+      - id: check-executables-have-shebangs
+
+  # Linting: Python code (see the file .flake8)
+  - repo: https://github.com/PyCQA/flake8
+    rev: "6.0.0"
+    hooks:
+      - id: flake8
+
+ci:
+  # pre-commit.ci will open PRs updating our hooks once a month
+  autoupdate_schedule: monthly

.prettierignore

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+nbgitpuller/templates/