chore: migrate to pnpm

Author: its-miroma

.github/CODEOWNERS

@@ -5,5 +5,5 @@
 crowdin.yaml       @FabricMC/developers
 netlify.toml       @FabricMC/developers
 package.json       @FabricMC/developers
-package-lock.json  @FabricMC/developers
 patches            @FabricMC/developers
+pnpm-*.yaml        @FabricMC/developers

.gitignore

@@ -10,8 +10,7 @@
 .DS_Store
 
 # Alternative Package Locks
-pnpm-lock.yaml
-pnpm-workspace.yaml
+package-lock.json
 yarn.lock
 
 # LanguageTool Dictionaries and False Positives