chore: use yarn only (#6141)

* use-only-yarn

* cicd-changes

* update-readme-and-contributing

* fix-build-log-url-error

* chore: Update package.json to use yarn commands

* yarn-install

* docs: Update workflow to clarify docs build step

* space

docs/.gitignore

@@ -15,6 +15,14 @@
 .env.test.local
 .env.production.local
 
+# Yarn
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*