Redesign site and modernize tooling

Replace the HTML5-UP "Strata" theme with a Swiss-minimal single-page
design (plain CSS, Space Grotesk / Hanken Grotesk / Space Mono). Rewrite
copy for current positioning: Staff Data, Analytics & AI Engineer at
Swisscom, open to new work. Experience shown as a pipeline timeline;
contact simplified to email + LinkedIn (drop the broken form).

Prune unused deps (lightbox, FontAwesome, sass/gatsby-plugin-sass) and
the old SCSS, fonts and gallery assets. Fix package.json metadata.

Harden the Gitea deploy: merge build+deploy into one job (removes the
deprecated artifact upload/download handoff), bump Node 18 -> 20, use
npx gatsby build. Rename .nvrmc -> .nvmrc and refresh the README.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/workflow.yaml

@@ -4,37 +4,25 @@ run-name: ${{ gitea.actor }} is deploying this page to production.
 on:
   push:
     branches:
-      - master  
+      - master
 
 jobs:
-  build:
+  build-and-deploy:
     runs-on: ubuntu-latest
     steps:
-      - name: Repository auschecken
-        uses: actions/checkout@v3
+      - name: Checkout repository
+        uses: actions/checkout@v4
 
-      - name: Node.js einrichten
-        uses: actions/setup-node@v3
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
 
-      - name: Clear node_modules and package-lock
-        run: |
-          rm -rf node_modules
-          rm -f package-lock.json
+      - name: Install dependencies
+        run: npm install --legacy-peer-deps --force
 
-      - name: Install Dependencies
-        run: |
-          npm install --legacy-peer-deps --force
-          npm install -g gatsby-cli
-
-      - name: Clean Gatsby cache
-        run: |
-          gatsby clean
-
-      - name: Build Gatsby Site
-        run: |
-          gatsby build
+      - name: Build Gatsby site
+        run: npx gatsby build
         env:
           NODE_ENV: production
           CI: true
@@ -46,22 +34,6 @@ jobs:
             exit 1
           fi
 
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@v3
-        with:
-          name: gatsby-build
-          path: public/
-
-  deploy:
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-      - name: Download build artifacts
-        uses: actions/download-artifact@v3
-        with:
-          name: gatsby-build
-          path: public
-
       - name: Install SSH key
         uses: shimataro/ssh-key-action@v2
         with: