Add deprecation to upgrade guide for new includes dir

docs/upgrade-guide/v7.0.md

@@ -73,3 +73,97 @@ the Trash Guides.
 
 [ref]: /yaml/config-reference/index.md
 [config_create]: ../cli/config/config-create.md#template
+
+## Deprecations
+
+These features still work, but they will stop working in a future release.
+
+### Dedicated Includes Directory {#include-dir}
+
+The root directory for relative local include paths has changed. Previously, relative paths provided
+to the [`config` include directive](../yaml/config-reference/include.md#config) were rooted in
+`${appdatadir}/configs`. Putting includes in the `configs` directory is now deprecated. Going
+forward, all includes should reside in `${appdatadir}/includes`.
+
+Migrating to the new directory is simple. Simply cut & paste any subdirectories containing include
+template YAML files to the new `includes` subdirectory. Assume you have the current structure:
+
+```txt
+.
+├── configs/
+│   ├── config1.yml
+│   ├── config2.yml
+│   └── local/
+│       ├── my-include1.yml
+│       └── my-include2.yml
+└── includes/
+```
+
+An empty top-level `includes` will be created for you by Recyclarr. In the example above, we need to
+move the `local` directory to this top-level `includes` directory. The final structure should look
+like this:
+
+```txt
+.
+├── configs/
+│   ├── config1.yml
+│   └── config2.yml
+└── includes/
+    └── local/
+        ├── my-include1.yml
+        └── my-include2.yml
+```
+
+By doing this, the relative paths in your `templates` section does not need to change:
+
+```yml
+include:
+  - config: local/my-include1.yml
+  - config: local/my-include2.yml
+```
+
+#### Recommended File Structure Changes (Optional) {#rec-structure-change}
+
+If you followed the recommended file structure for your includes, then chances are you already have
+a `configs/include` directory. To avoid having the path look weird, such as
+`includes/include/my-include1.yml`, it is recommended that you remove the intermediate `include`
+directory or rename it. For example, you could change this:
+
+```yml
+include:
+  - config: include/my-include1.yml
+  - config: include/my-include2.yml
+```
+
+To:
+
+```yml
+include:
+  - config: my-include1.yml
+  - config: my-include2.yml
+```
+
+And have your filesystem change from:
+
+```txt
+.
+├── configs/
+│   ├── config1.yml
+│   └── config2.yml
+└── includes/
+    └── include/
+        ├── my-include1.yml
+        └── my-include2.yml
+```
+
+To this:
+
+```txt
+.
+├── configs/
+│   ├── config1.yml
+│   └── config2.yml
+└── includes/
+    ├── my-include1.yml
+    └── my-include2.yml
+```