fix(html): resolve validation errors, implement dynamic MDX heading shifting, and improve accessibility

data/blog/en/johannes-gleich-starts-as-senior-key-account-manager.mdx

@@ -11,15 +11,15 @@ public: false
 
 KLZ Cables kicks off the new year with a strong addition to the team: Since January 2026, Johannes Gleich has taken on the role of Senior Key Account Manager. With him, we gain not only additional sales power, but also decades of experience and a valuable industry network.
 
-### **1. A familiar face for effective collaboration**
+## 1. A familiar face for effective collaboration
 
 Johannes is no stranger to KLZ: During his more than ten years at the LAPP Group, our team had the pleasure of working with him and greatly appreciated the collaboration. This existing familiarity and mutual trust make his start enormously easier and promise productive cooperation from day one.
 
-### **2. Professional background: Experience meets technical depth**
+## 2. Professional background: Experience meets technical depth
 
 At around 50 years of age, Johannes combines solid professional experience with fresh motivation. His foundation is a technical education in electrical engineering. This basis enables him not only to sell our products, but also to explain and classify them in their full technical depth.
 
-**His career at a glance:**
+His career at a glance:
 
 <TechnicalGrid
   title="Career Stations"
@@ -31,7 +31,7 @@ At around 50 years of age, Johannes combines solid professional experience with
 
 Over the past eleven years, he has established himself as an expert in the requirements of large infrastructure providers. He knows the industry's challenges—technical, economic, and strategic—firsthand.
 
-### **3. Expertise: Tenders, standards, and market trends**
+## 3. Expertise: Tenders, standards, and market trends
 
 What makes Johannes particularly valuable to our team is his specialized expertise:
 
@@ -45,21 +45,21 @@ What makes Johannes particularly valuable to our team is his specialized experti
   ]}
 />
 
-### **4. A reliable partner at eye level**
+## 4. A reliable partner at eye level
 
 Johannes is highly valued by customers as a true "caretaker". He takes responsibility and stands out for his balanced yet clear negotiation skills. His ability to implement complex requirements in a structured manner has already proven itself in past joint projects with KLZ.
 
-### **5. New role and goals at KLZ Cables**
+## 5. New role and goals at KLZ Cables
 
 In his new position, Johannes will strategically strengthen sales and operatively relieve the management.
 
-**His core responsibilities include:**
+His core responsibilities include:
 
 - **Targeted Support:** Focus on municipal utilities, grid operators, and energy suppliers.
 - **Market Penetration:** Building contacts in the renewables and civil engineering sectors.
 - **Strategic Planning:** Implementing sales activities without administrative boundaries to unfold maximum dynamism.
 
-### **6. Outlook**
+## 6. Outlook
 
 We are especially pleased that Johannes has found the space at KLZ to optimally use all his knowledge for our customers. With his combination of technical know-how, market experience, and personal integrity, he is exactly in the right place to sustainably promote the growth of KLZ Cables.