add prepared environment page

Author: boegel

docs/prepared-environment.md

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+# Prepared environment
+
+Follow the instructions below to get access to a temporary virtual machine
+that you can use for the hands-on exercises during this tutorial.
+
+
+!!! note "Only available during EESSI tutorial at ISC'26"
+
+    This environment is only available during the EESSI tutorial at [ISC'26](https://isc-hpc.com),
+    on Monday 22 June 2026.
+
+    Alternatively, you can use a system where EESSI is already available, see [here](https://eessi.io/docs/systems).
+
+!!! warning "Avoid losing any data!"
+
+    Please make sure you copy any important files before the end of the day,
+    since the environment will be destroyed shortly after, and any files in the account
+    you were using will be lost forever.
+
+
+!!! tip "Do not hesitate to ask for help!"
+
+    During the ISC'26 tutorial, raise your hand to ask a question or get help.
+
+    Afterwards, join the EESSI Slack via the "Slack channel" link on the EESSI website
+    [https://eessi.io](https://eessi.io), and ask your question there.
+
+## Step 1: Create an account
+
+Sign up via https://mokey.tutorial.eessi.science/auth/signup .
+
+Accounts will only be approved for access on the day of the tutorial,<br/>
+**so please take note of your username and password** !
+
+Note that the *“Reset password”* link does **not** work!
+
+## Step 2: Logging in
+
+Gain access via *either* SSH or a web browser. **Pick one and stick to it!**
+
+### Shell access (SSH)
+
+For shell access, use:
+```
+ssh tutorial.eessi.science
+```
+
+### Via web browser
+
+Browse to https://tutorial.eessi.science
+
+- Make sure to change default “Time” to 4 hours
+- Take 4 cores
+
+Alternative, use the login node for hands-on, 16 cores so should be fine to share for a small group.