feat: consolidate Ebantic, Everis, and Indra into single Avantik freelance entry

**Changes:**
- Merged three separate experiences (Indra, Everis, Ebantic) into one freelance entry
- Company: Avantik (no logo)
- Position: Freelance Fullstack Developer / Desarrollador Fullstack Freelance
- Date range: Sep 2015 - Apr 2017 (covers all three periods)
- Location: Barcelona, Spain/España

**Short Description:**
- Shows summary of freelance work for multiple clients
- Mentions all three companies: Ebantic, Everis, Indra

**Long Version (Responsibilities):**
- Each responsibility bullet includes company name and date range
- Ebantic (Sep 2016 - Apr 2017): API design, CI/CD pipelines, testing, deployment
- Everis (Apr 2016 - Nov 2016): React applications for multiple clients
- Indra (Sep 2015 - Feb 2016): Project management, customer feedback

**Technologies:**
- Combined all technologies from the three experiences
- React, Node.js, JavaScript, Redux, Webpack, Java, API Design, CI/CD, DevOps

**Result:**
- Single entry in short mode showing freelance work
- Detailed breakdown per company when expanded to long mode
- No company logo (companyLogo: "")
- Applied to both English and Spanish versions

data/cv-en.json

@@ -175,70 +175,31 @@
       "shortDescription": "Full-stack development with video system integration for advertisement inclusion in gas station networks."
     },
     {
-      "position": "Fullstack Developer",
-      "company": "Ebantic",
-      "companyURL": "https://ebantic.com/en/",
+      "position": "Freelance Fullstack Developer",
+      "company": "Avantik",
+      "companyURL": "",
       "location": "Barcelona, Spain",
-      "startDate": "2016-09",
+      "startDate": "2015-09",
       "endDate": "2017-04",
       "current": false,
       "responsibilities": [
-        "Worked with back-end developers to design APIs",
-        "Oversaw and implemented automated build and deployment pipelines",
-        "Analyzed existing software implementations to identify areas requiring improvement",
-        "Tested functional compliance of company products",
-        "Tested and deployed scalable and highly available software products"
+        "Ebantic (Sep 2016 - Apr 2017): Worked with back-end developers to design APIs, oversaw and implemented automated build and deployment pipelines, analyzed existing software implementations to identify areas requiring improvement, tested functional compliance of company products, tested and deployed scalable and highly available software products",
+        "Everis (Apr 2016 - Nov 2016): Created two React applications for two different clients, implemented modern frontend architectures with React ecosystem",
+        "Indra (Sep 2015 - Feb 2016): Discussed project progress with customers, collected feedback on different stages, directly addressed customer concerns and implemented solutions"
       ],
       "technologies": [
         "React",
         "Node.js",
+        "JavaScript",
+        "Redux",
+        "Webpack",
+        "Java",
         "API Design",
         "CI/CD",
         "DevOps"
       ],
-      "companyLogo": "ebantic.png",
-      "shortDescription": "API design and automated deployment pipelines. Software testing and scalability implementation."
-    },
-    {
-      "position": "FullStack Developer",
-      "company": "Everis",
-      "companyURL": "https://www.everis.com/",
-      "location": "Barcelona, Spain",
-      "startDate": "2016-04",
-      "endDate": "2016-11",
-      "current": false,
-      "responsibilities": [
-        "Created two React applications for two different clients",
-        "Implemented modern frontend architectures with React ecosystem"
-      ],
-      "technologies": [
-        "React",
-        "JavaScript",
-        "Redux",
-        "Webpack"
-      ],
-      "companyLogo": "everis.png",
-      "shortDescription": "React application development for multiple clients."
-    },
-    {
-      "position": "Fullstack Developer",
-      "company": "Indra",
-      "companyURL": "https://www.indracompany.com/",
-      "location": "Barcelona, Spain",
-      "startDate": "2015-09",
-      "endDate": "2016-02",
-      "current": false,
-      "responsibilities": [
-        "Discussed project progress with customers, collected feedback on different stages",
-        "Directly addressed customer concerns and implemented solutions"
-      ],
-      "technologies": [
-        "Java",
-        "JavaScript",
-        "Web Development"
-      ],
-      "companyLogo": "indra.png",
-      "shortDescription": "Project management and customer feedback collection across development stages."
+      "companyLogo": "",
+      "shortDescription": "Freelance work for multiple clients (Ebantic, Everis, Indra) developing React applications, designing APIs and managing projects."
     },
     {
       "position": "Technical Director / Programmer",