feat!: restructure erstie guide, expand

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

summaries/semester1.md

@@ -1 +1,18 @@
 # Semester 1
+## Algorithms and Data Structures
+A summary for the full course. Some examples were AI generated (in Tikz)
+- [Algorithms & Datastructures Summary (EN)](https://github.com/janishutz/eth-summaries/blob/main/semester1/algorithms-and-datastructures/ad-janishutz.pdf) Author: Janis Hutz
+
+## Linear Algebra
+Still using my old Cheat-Sheet style
+- [Linear Algebra Cheat-Sheet (EN)](https://github.com/janishutz/eth-summaries/blob/main/semester1/linear-algebra/linAlg-janishutz.pdf) Author: Janis Hutz
+
+## Introduction to Programming
+A short overview of the most important concepts and pitfalls
+- [Introduction to Programming Short summary (EN)](https://github.com/janishutz/eth-summaries/blob/main/semester1/eprog/eprog-janishutz.pdf) Author: Janis Hutz
+
+## Discrete Maths
+Since my Cheat-Sheet isn't particularly great for this course, I have not published it on ComSol, but I am making it available here,
+both the GoodNotes file and PDF
+- [Cheat-Sheet PDF](https://static.janishutz.com/ETH/DM-Cheatsheet-janishutz.pdf) Author: Janis Hutz
+- [Cheat-Sheet Goodnotes file](https://static.janishutz.com/ETH/DM-Cheatsheet-janishutz.goodnotes) Author: Janis Hutz