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

data/blog/en/what-makes-a-first-class-cable-find-out-here.mdx

@@ -50,7 +50,7 @@ The right choice of cable is therefore not just a technical decision – it is a
 />
 <h4>Materials: What makes a cable durable and efficient?</h4>
 Choosing the right materials is crucial to making cables both durable and efficient. Two of the most common and important materials used in cables are copper and aluminum. They play a central role in the electrical conductivity and durability of cables.
-**The role of copper and aluminum**
+The role of copper and aluminum
 Copper is one of the best materials for conducting electricity as it has excellent electrical conductivity. It minimizes resistance, resulting in less energy loss and better efficiency. Copper cables are also extremely durable as copper is resistant to corrosion and works reliably even at extreme temperatures. For this reason, copper is particularly popular in the electronics, energy and automotive industries.
 Aluminum, on the other hand, is cheaper and lighter than copper, making it a preferred choice for larger cable applications, such as in high-voltage transmission. However, aluminum has a lower electrical conductivity than copper, which is why it is usually used in larger cross-sections to achieve the same resistance. Nevertheless, its lower weight and material costs make it an attractive alternative to copper, especially in large infrastructure projects.Both materials are therefore essential for the production of cables that are both reliable and economical. But in order to promote a more sustainable future, environmentally friendly alternatives and recycling potential are also of great importance.
 - Eco-friendly alternatives and recycling potential<br />
@@ -68,7 +68,7 @@ The demand for environmentally friendly materials is growing as more and more co
 />
 <h4>Technology: Advanced designs for optimal performance</h4>
 Advanced cable technologies are critical to maximize the performance and safety of electrical systems, especially with regard to renewable energy sources. Two key technologies are insulation and sheathing, and specialized cables for renewable energy.
-**Insulation and sheathing: quality meets safety**<br />
+Insulation and sheathing: quality meets safety<br />
 The insulation of a cable protects against short circuits and external influences such as moisture or mechanical damage. Materials such as PVC, PE and XLPE offer excellent protection and guarantee safe power transmission. The protective sheath protects the cable from UV radiation and extreme temperatures, which significantly extends its service life and increases safety.**Cables for renewable energy sources**<br />
 Solar and wind energy require specialized cables that can withstand extreme weather conditions and high loads. Solar cables must be UV resistant and suitable for DC systems, while wind power cables must be flexible and corrosion resistant to withstand the constant movement of rotor blades. These advanced cables enable the efficient and safe transportation of energy, which is crucial for the sustainability and economic viability of renewable energy.
 Overall, these technologies help maximize the efficiency and safety of cables and support a sustainable energy future.
@@ -87,7 +87,7 @@ There are numerous standards and certificates that cable manufacturers must comp
 - **RoHS** (Restriction of Hazardous Substances): This standard ensures that cables do not contain hazardous substances such as lead or mercury, which ensures both consumer safety and environmental protection.
 
 Overall, these technologies help maximize the efficiency and safety of cables and support a sustainable energy future.
-### Understanding VDE and NEN Standards for High-Quality Cables
+## Understanding VDE and NEN Standards for High-Quality Cables
 When it comes to ensuring safety, efficiency, and compliance in the cable industry, standards like **VDE** and **NEN** play a critical role. As experts in the field, we ensure that our products not only meet but often exceed these rigorous standards, providing peace of mind for your projects.
 <h4>**VDE: A Benchmark for Safety and Quality**</h4>
 The **VDE (Verband der Elektrotechnik, Elektronik und Informationstechnik)** certification is synonymous with high safety and quality standards in Germany and across Europe. Products bearing the VDE mark have undergone comprehensive testing for:
@@ -117,7 +117,7 @@ The increasing importance of sustainability certificates is not only a response
 <h4>Conclusion: What really makes a first-class cable</h4>
 A first-class cable is characterized by a perfect balance between quality, efficiency and sustainability. Choosing the right cable is not just a question of technical requirements, but also an important step towards a more sustainable future. A high-quality cable ensures reliable performance and maximum efficiency, reduces energy loss and at the same time offers a high standard of safety.**Quality and efficiency**<br />
 A good cable is designed to work efficiently over the long term. Materials such as copper and aluminum ensure excellent conductivity, while modern insulation materials and protective layers extend the cable&#8217;s service life and protect it against external influences such as moisture and corrosion. This is particularly important in applications such as power transmission and the use of renewable energy, where efficiency and reliability are top priorities.
-**Sustainability**<br />
+Sustainability<br />
 In a world that is increasingly focusing on sustainability, environmental protection is playing an ever greater role when choosing a cable. Recyclability, sustainable production processes and certifications such as RoHS or recycling seals are decisive factors that determine the ecological footprint of a cable. Integrating these elements into cable production helps to minimize resource consumption and reduce waste, which contributes to a more environmentally friendly and resource-efficient future.
 <VisualLinkPreview 
   url="https://sustainablebrands.com/read/evolving-infrastructure-wire-cable-prioritize-sustainability"