feat: Implement initial version of formatter app

packages/docs/pages/apps/formatter/connection.md

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+# Formatter
+
+Formatter is a built-in app shipped with Automatisch, and it doesn't need to talk with any other external service to run. So there are no additional steps to use the Formatter app. It can be used as an action, and you can use it to format the data from the previous steps. It can be used to format the data in the following ways.
+
+## Text
+
+- Capitalize
+- Convert HTML to Markdown
+- Convert Markdown to HTML
+- Use Default Value
+- Extract Email Address