WIP - CE installation, migration guides, opt-out stats (#291)

* MM CE migration guides, opt-out stats

* added toc

* mergin maps ce

Author: alex-cit

src/dev/ce-migration/index.md

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+# Migration Guides
+[[toc]]
+
+Migration guides are here to help you migrate to the latest version of [<MainPlatformName /> Community Edition](../mergince/).
+
+## Migration guide to 2023.2
+

src/dev/ce-server-not-configured.jpg

@@ -1,7 +1,36 @@
 # Mergin Maps Community Edition
+[[toc]]
 
-<MainPlatformNameLink /> is a web platform for storage and synchronisation of data between mobile devices, <MainPlatformNameLink /> service and QGIS Desktop.
+SaaS <MainPlatformName /> service is a web platform for storage and synchronisation of data between mobile devices, <MainPlatformNameLink /> service and QGIS Desktop. 
 
-The good news is that <MainPlatformName /> Community Edition (<MainPlatformName /> CE) is licensed as open source software and therefore it is possible to do your custom deployments.
+There is also <MainPlatformName /> Community Edition (<MainPlatformName /> CE) that is licensed as open source software. The source code for <MainPlatformName /> CE can be modified and used for custom deployments. You can contribute your code to <GitHubRepo id="MerginMaps/mergin" />.
 
+::: tip
+If you need more functionality than <MainPlatformName /> CE offers, explore our [subscription plans](../setup/subscriptions/).
+:::
+
+## How to deploy Mergin Maps CE
 **Interested in deploying <MainPlatformName /> CE?** You can start by going to <GitHubRepo id="MerginMaps/mergin" /> on GitHub and read instructions on how to deploy it for your platform.
+
+## How to opt out of sending statistics
+<SinceBadge type="Server" version="2023.2" />
+By default, <MainPlatformName /> CE collects anonymous usage information to make the service better. There is a variable named `COLLECT_STATISTICS` that controls if statistics are collected and sent to <MainPlatformNameLink />. 
+
+If you do not want to provide these data, you can opt-out any time by setting this variable to *false* 
+```
+COLLECT_STATISTICS=false
+```
+
+## Mergin Maps CE server is not properly configured
+Did you get an error that the server is not properly configured?
+![CE server not configured error](./ce-server-not-configured.jpg "CE server not configured error")
+
+1. Check if `MERGIN_BASE_URL` docker environment variable is assigned correctly.
+   `MERGIN_BASE_URL` should contain the URL of your <MainPlatformName /> CE server.
+   
+2. Restart the container with the `MERGIN_BASE_URL` variable
+
+## Migrate to the latest Mergin Maps CE version
+To migrate from older <MainPlatformName /> Community Edition to the latest version, follow our [Migration Guides](./ce-migration/).
+
+