feat!: restructure erstie guide, expand

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

.vitepress/config.mts

@@ -12,30 +12,46 @@ export default defineConfig({
         nav: [
             { text: 'Home', link: '/' },
             { text: 'Summaries', link: '/summaries' },
-            { text: 'Erstie Guide', link: '/ersties', activeMatch: '/ersties/' },
+            { text: 'ETH (Erstie) Guide', link: '/guide', activeMatch: '/guide/' },
         ],
         search: {
             'provider': 'local'
         },
         sidebar: {
-            '/ersties': [
+            '/guide': [
                 {
-                    text: 'Erstie Guide',
-                    base: '/ersties',
+                    text: 'A guide to ETH',
+                    base: '/guide',
                     items: [
                         { text: 'Introduction', link: '/' },
                         { text: 'Student Life', link: '/student-life' },
-                        { text: 'Semester 1 Tips & Tricks', link: '/semester1-tips' },
-                        { text: 'Semester 2 Tips & Tricks', link: '/semester2-tips' },
-                        { text: 'ETH Infrastructure Guide', link: '/infra' },
-                        { text: 'Git & GitLab', link: '/git' },
                         { text: 'Use of AI', link: '/pretendintelligence' },
                         { text: 'Exam (Preparation)', link: '/exams' },
                         { text: 'Buildings', link: '/buildings' },
-                        { text: 'Semester Planning', link: '/semester-planning' },
-                        { text: 'Things to consider / try', link: '/things-to-try' },
                         { text: 'Reference / Useful links', link: '/reference' },
                     ]
+                },
+                {
+                    text: 'Semesters',
+                    base: '/guide/semesters',
+                    items: [
+                        { text: 'Semester Planning', link: '/semester-planning' },
+                        { text: 'Semester 1', link: '/semester1' },
+                        { text: 'Semester 2', link: '/semester2' },
+                        { text: 'Semester 3', link: '/semester3' },
+                        { text: 'Semester 4', link: '/semester4' },
+                        { text: 'Semester 5 and onwards', link: '/semester5-onwards' },
+                        { text: 'Masters', link: '/masters' },
+                    ]
+                },
+                {
+                    text: 'Infrastructure and More',
+                    base: '/guide/infra',
+                    items: [
+                        { text: 'ETH Infrastructure Guide', link: '/' },
+                        { text: 'Git & GitLab', link: '/git' },
+                        { text: 'Things to consider / try', link: '/things-to-try' },
+                    ]
                 }
             ],
             '/summaries': [
@@ -59,7 +75,7 @@ export default defineConfig({
             copyright: 'Copyright © 2026 Janis Hutz'
         },
         socialLinks: [
-            { icon: 'github', link: 'https://git.janishutz.com/eth-janishutz/website' }
+            { icon: 'git', link: 'https://git.janishutz.com/eth-janishutz/website' }
         ]
     }
 })