Fix missing images on English pages

Hugo only auto-shares page-bundle resources across translations when
each language has its own content directory; with filename-based
translation (index.fr.md / index.en.md in the same folder) a resource
with no language code is assigned to the default language only. Add
.en.-suffixed copies of every image referenced from English pages and
point the English markdown at them.

content/netlab/first_lab/_index.en.md

@@ -43,7 +43,7 @@ Our lab will simulate a VXLAN topology consisting of:
 
 The following diagram illustrates the VXLAN topology:
 
-![VXLAN Topology](VXLAN.fr.svg#center)
+![VXLAN Topology](VXLAN.en.svg#center)
 
 Here's the Containerlab topology file (`lab_vxlan.yml`) used for this configuration:
 
@@ -126,7 +126,7 @@ We'll deploy the lab with **DevPod** in two ways:
    - Choose your default IDE.
    - Finally, click **Create Workspace**.
 
-   ![DevPod Configuration](devpod_configuration.fr.png#center)
+   ![DevPod Configuration](devpod_configuration.en.png#center)
 
 ### 2. Using a Local Folder 🗂️
 
@@ -135,7 +135,7 @@ If you prefer to use your local repository:
 - The only difference is in the **Workspace source**.
 - Simply point it to your local repository.
 
-   ![DevPod Configuration - Local](devpod_configuration_local.fr.png#center)
+   ![DevPod Configuration - Local](devpod_configuration_local.en.png#center)
 
 ## Starting the Lab 🎬
 
@@ -169,7 +169,7 @@ If you prefer to use your local repository:
 
    Ports (for example, port 50080 mentioned in `devcontainer.json`) are forwarded. Access the graphical view via [localhost](http://localhost:50080).
 
-   ![Graph View](Graph_view.fr.png#center)
+   ![Graph View](Graph_view.en.png#center)
 
 ## Using EdgeShark 🦈
 
@@ -199,12 +199,12 @@ DOCKER_DEFAULT_PLATFORM= docker compose up -d
 Access EdgeShark via [localhost:5001](http://localhost:5001).
 
 - **EdgeShark View**:  
-  ![EdgeShark View](edgeshark.fr.png#center)
+  ![EdgeShark View](edgeshark.en.png#center)
 
 - **Integration with Wireshark**:  
   By clicking the Wireshark icon in EdgeShark, you can launch Wireshark locally.  
-  ![EdgeShark Interface](edgeshark_interface.fr.png#center)  
-  ![EdgeShark and Wireshark](edge_wireshark.fr.png#center)
+  ![EdgeShark Interface](edgeshark_interface.en.png#center)  
+  ![EdgeShark and Wireshark](edge_wireshark.en.png#center)
 
 ## Conclusion 🎉