refactor: reorganize skills sidebar layout (7 left, 6 right)

- Update splitSkills logic to put 7 categories on left sidebar, 6 on right
- Reorder skills: Frontend Technologies now at position 5, Legacy Enterprise Technologies at position 6 (last on left)
- Apply changes to both English and Spanish CV data
- Clean up unused enhanced template and CSS files

Left sidebar (Page 1):
1. AI-Assisted Development
2. SAP Technologies
3. Programming Languages
4. Go Ecosystem
5. JavaScript Ecosystem
6. Frontend Technologies
7. Legacy Enterprise Technologies

Right sidebar (Page 2):
8. Backend Technologies
9. Databases
10. Infrastructure & Servers
11. DevOps & CI/CD
12. Team Management
13. Design Tools

internal/handlers/cv.go

@@ -199,18 +199,20 @@ func (h *CVHandler) ExportPDF(w http.ResponseWriter, r *http.Request) {
 }
 
 // splitSkills splits skill categories between left (page 1) and right (page 2) sidebars
-// The split is done at the midpoint to evenly distribute skills
+// Left sidebar shows first 7 categories, right sidebar shows remaining categories
 func splitSkills(skills []models.SkillCategory) (left, right []models.SkillCategory) {
 	if len(skills) == 0 {
 		return nil, nil
 	}
 
-	// Calculate midpoint
-	mid := len(skills) / 2
+	// Split at index 7 (first 7 items on left)
+	splitIndex := 7
+	if len(skills) < splitIndex {
+		return skills, nil
+	}
 
-	// Split at midpoint
-	left = skills[:mid]
-	right = skills[mid:]
+	left = skills[:splitIndex]
+	right = skills[splitIndex:]
 
 	return left, right
 }