feat!: restructure erstie guide, expand

Expanded the erstie guide massively (added guide for each semester),
restructured to new URLs, added summaries details

guide/reference.md

@@ -0,0 +1,34 @@
+# Quick Reference / Useful links
+Find below a list of important links and other short info to get started at ETH more quickly
+
+## My Links + Discord
+- My Summaries: https://eth.janishutz.com/summaries
+- Contact Email (for ETH-related things): school@janishutz.com
+- My profile on ComSol: https://exams.vis.ethz.ch/user/jahutz
+- Discord: @janishutz
+- ETH D-INFK Discord: https://discord.com/invite/eth-dinfk
+
+
+## VIS (Verein der Informatik Studierenden)
+<!-- Links are automatically anchored -->
+- Website: https://vis.ethz.ch
+- VIS Erstie Guide: https://vis.ethz.ch/en/current/info-first-year-students/
+- Exam Collection (ComSol): https://exams.vis.ethz.ch
+- Grade Statistics: https://vis.ethz.ch/en/services/gradestatistics/
+- VIS Events: https://vis.ethz.ch/en/events/
+
+
+## ETH & Department
+- VVZ (Vorlesunsverzeichnis): https://vvz.ethz.ch
+- Department Website: https://inf.ethz.ch
+- Department GitLab: https://gitlab.inf.ethz.ch
+- Moodle: https://moodle-app2.let.ethz.ch
+- Mail: Via [Outlook online](https://outlook.office.com)
+
+
+### MyStudies
+MyStudies is the Platform where you register for courses, exams and more.
+You can find it at http://mystudies.ethz.ch, which redirects you to https://www.lehrbetrieb.ethz.ch/myStudies/login.view
+
+Course registration typically opens early December for the Spring Semester and early July for the Autumn Semester.
+Be sure to be quick if you do anything outside the normal courses, as some courses have limited capacities!