import export docs and docker tests

Dockerfile

@@ -11,7 +11,7 @@ RUN chmod +x boot.sh
 
 RUN apk add --no-cache --virtual .build-deps gcc musl-dev postgresql-dev zlib-dev jpeg-dev libressl-dev libffi-dev openssl-dev && \
     python -m venv venv && \
-    python -m pip install --upgrade pip && \
+    /opt/recipes/venv/bin/python -m pip install --upgrade pip && \
     venv/bin/pip install -r requirements.txt --no-cache-dir &&\
     apk --purge del .build-deps
 

docs/features/import_export.md

@@ -0,0 +1,22 @@
+This application features a very versatile import and export feature in order 
+to offer the best experience possible and allow you to freely choose where your data goes.
+
+The Module is build with maximum flexibility and expandability in mind and allows to easily add new
+integrations to allow you to both import and export your recipes into whatever format you desire.
+
+Feel like there is an important integration missing ? Just take a look at the [integration issues](https://github.com/vabene1111/recipes/issues?q=is%3Aissue+is%3Aopen+label%3Aintegration) or open a new one
+if your favorite one is missing.
+
+!!! warning "WIP"
+    Please note that this feature is relatively new and many integrations are missing.
+    Additionally, many recipe applications provide formats that are not structured in an easily machine-readable way
+    and thus require a lot of work to integrate even tough the module is very versatile.
+    If you are good at writing parsers feel free to add new integrations for your favorite services.
+
+
+## Default
+The default integration is the build in (and preferred) way to import and export recipes.
+It is maintained with new fields added and contains all data to transfer your recipes from one installation to another.
+
+It is also one of the few recipe formats that is actually structured in a way that allows for 
+easy machine readability if you want to use the data for any other purpose. 

mkdocs.yml

@@ -33,6 +33,7 @@ nav:
       - Shopping: features/shopping.md
       - Authentication: features/authentication.md
       - Storages and Sync: features/external_recipes.md
+      - Import/Export: features/import_export.md
   - System:
       - Updating: system/updating.md
       - Permission System: system/permissions.md