add modules index to settings subfolder

docs/_blocks/_module_overview_text.mdx

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+Modules are included in the firmware and allow users to extend the functionality of their mesh or device.
+
+The list of current modules is as follows:
+
+- Canned Message Module
+- External Notification Module
+- Input Broker Module
+- Range Test Module
+- Serial Module
+- Store and Forward Module
+- Telemetry Module
+
+:::tip
+Once module settings are changed, a **reset** is required for them to take effect.
+:::

docs/settings/modules/index.mdx

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+---
+id: modules
+title: Modules Overview
+sidebar_label: Modules
+---
+import ModuleOverviewText from '@site/docs/_blocks/_module_overview_text.mdx';
+
+<ModuleOverviewText/>