Add basic pre-commit rules

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: trailing-whitespace
+        exclude_types: [markdown]
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files

data/plugins/official/dice.yaml

@@ -6,4 +6,3 @@ description: A combined dice rolling and calculator bot.
 public_instances:
   - "@dice:maunium.net"
   - "@dice:t2bot.io"
-

data/plugins/official/factorial.yaml

@@ -6,4 +6,3 @@ description: A bot to calculate unexpected factorials.
 public_instances:
   - "@factorial:maunium.net"
   - "@factorial:t2bot.io"
-