Merge pull request #46 from fosscord/add/maintenance

* Moves updating guide -> maintenance
* Adds `when should server restart` page. Inspired by this question: https://discord.com/channels/806142446094385153/898197424340860928/1062927020750802985

docs/setup/server/maintenance/index.md

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+# Maintenance
+
+## [When do I have to restart the server?](restart.md)
+
+## [Updating Fosscord-server](updating.md)

docs/setup/server/maintenance/restart.md

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+# When must the server restart?
+
+Fosscord-server must restart in the following cases:
+
+* The .env file or config (database or [CONFIG_PATH](configuration/env.md)) has changed.
+* Files in the `client_test`, `preload-plugins` folders of inside `assets` have changed.
+* Files inside `src` have changed (*remember to `npm run build`*).
+* The `assets/schemas.json` file has changed.
+* The [RabbitMQ](configuration/rabbitmq.md) connection has been lost.
+
+For all other cases, you do not need to restart the server. For example:
+
+* Running `npm run generate:client`
+* Running `npm run generate:changelog`
+* Editing any table in the database other than `config`. For example, to edit a `users` [`rights`](security/rights.md)
+* Database connection was lost (this should auto reconnect)
+
+This is not an exhaustive list. If a change you made is not applied, the first thing you should try is restarting.