feat: add project logo support and rename to Personal Projects

Changes:
- Created /static/images/projects/ folder for project logos
- Added ProjectLogo field to Project struct
- Updated cv-en.json and cv-es.json with projectLogo fields:
  - somosunaola.png for Somos Una Ola
  - herrumbre-vivo.png for Herrumbre Vivo Arte
- Updated template to display project logos with fallback to web icon
- Added CSS styling for project logo images (80×80px)
- Renamed section from "Projects" to "Personal Projects"

Logo images will display when PNG files are added to /static/images/projects/

data/cv-en.json

@@ -706,6 +706,7 @@
     {
       "title": "Somos Una Ola - Beach Cleaning Initiative",
       "url": "https://somosunaola.org",
+      "projectLogo": "somosunaola.png",
       "location": "La Palma, Canary Islands",
       "startDate": "2023-07",
       "current": true,
@@ -720,6 +721,7 @@
     {
       "title": "Herrumbre Vivo Arte - Artist Portfolio Website",
       "url": "https://herrumbrevivoarte.com",
+      "projectLogo": "herrumbre-vivo.png",
       "location": "Fuencaliente, La Palma",
       "startDate": "2024",
       "current": true,