feat(docs): Migrate to mdbook

docs/src/app-template/introduction.md

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+# App Template
+
+## Background
+
+Since Helm [library charts](https://helm.sh/docs/topics/library_charts/) cannot be
+installed directly I have created a companion chart for the [common library](../common-library/introduction.md).
+
+## Usage
+
+In order to use this template chart, you would deploy it as you would any other Helm chart.
+By setting the desired values, the common library chart will render the desired resources.
+
+Be sure to check out the [common library docs](../common-library/introduction.md)
+and its [`values.yaml`](https://github.com/bjw-s/helm-charts/tree/main/charts/library/common/values.yaml) for
+more information about the available configuration options.
+
+#### Examples
+
+This is an example `values.yaml` file that would deploy the [vaultwarden](https://github.com/dani-garcia/vaultwarden)
+application. For more deployment examples, check out the [`examples` folder](https://github.com/bjw-s/helm-charts/tree/main/examples/).
+
+
+```yaml
+{{ #include ../../../examples/helm/values.yaml }}
+```
+
+## Source code
+
+The source code for the app template chart can be found
+[here](https://github.com/bjw-s/helm-charts/tree/main/charts/other/app-template).