docs: add update instructions in update.md

update.md

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+# Wiki.js - tyclipso fork - How to update
+
+## Relevant changes of the fork when updating
+
+- `client/themes/tyclipso/**`
+- `server/modules/rendering/html-tyclipso/**`
+
+## Setup dev environment
+
+Follow the instructions at https://docs.requarks.io/dev.
+Use the Visual Studio Code workflow to run the dev server.
+
+**In short:**
+
+1. Open the project in Visual Studio Code, with the Dev Container extension installed
+2. Reopen the project in the dev-container
+3. In the dev container terminal, run ```yarn dev```
+
+### First time: Additional steps
+
+If you set this up for the first time, make sure to:
+
+1. Activate the custom theme (https://docs.requarks.io/en/dev/themes#activate-your-custom-theme)
+  - open adminer at http://localhost:3001/, fill in the credentials from `dev/containers/config.yml`
+  - in the `settings` table in the `theming` row, set the theme name to `tyclipso`
+2. Restart the dev container
+
+## Steps by step: Update
+
+1. Merge `requarks/main` branch into `tyclipso`, resolve merge conflicts if necessary
+2. Run the dev containers, for more info checkout [Setup dev environment](#setup-dev-environment) section
+3. Check if the changes to the theme are still working as intended
+4. Create a new tag consisting of the following parts, e.g. `v2.5.297.1`
+  - the official release version (e.g. `v2.5.297`)
+  - minor version appendix
+5. Upload the merged commits and the new tag, a pipeline job will be started automatically to create a package of the
+   new version