docs: Add filter connection and actions

packages/docs/pages/apps/filter/actions.md

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+---
+favicon: /favicons/filter.svg
+items:
+  - name: Continue if conditions match
+    desc: Let the execution continue if the conditions match.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

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

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+# Filter
+
+Filter 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 Filter app. It can be used as an action and it filters the flow based on the given conditions. Available conditions are:
+
+- is equal
+- is not equal
+- is greater than
+- is less than
+- is greater than or equal
+- is less than or equal
+- contains
+- does not contain