introduction: applications: redirect to ardupilot wiki

Author: ES-Alexander

introduction/applications.md

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 {% include "../archive-notice.html" %}
 
+<meta http-equiv="refresh" content="0; URL=https://ardupilot.org/sub/docs/common-use-cases-and-applications.html" />
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+# This documentation has been moved to [https://ardupilot.org/sub/docs/common-use-cases-and-applications.html](https://ardupilot.org/sub/docs/common-use-cases-and-applications.html).
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+## You should be automatically redirected.
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+---
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 # Applications
 
 ArduSub provides the functionality needed for a wide variety of applications from simple observation-class ROVs to sophisticated research-class ROVs. Here's a short list of applications that ArduSub-powered ROVs can be used for: