Update image links to use markdown syntax

Co-authored-by: Ben Lambert <ben@blam.sh>
Co-authored-by: Fredrik Adelöw <freben@users.noreply.github.com>
Signed-off-by: Johan Haals <johan.haals@gmail.com>

docs/features/techdocs/addons.md

@@ -39,7 +39,9 @@ representative of physical spaces in the TechDocs UI:
 - `Component`: A [proposed-but-not-yet-implemented](https://github.com/backstage/backstage/issues/11109)
   virtual location, aimed at simplifying a common type of Addon.
 
-<img data-zoomable src="../../assets/techdocs/addon-locations.png" alt="TechDocs Addon Location Guide" />
+<!-- todo: Needs zoomable plugin -->
+
+![TechDocs Addon Location Guide](../../assets/techdocs/addon-locations.png)
 
 ### Addon Registry
 

docs/features/techdocs/architecture.md

@@ -9,7 +9,9 @@ description: Documentation on TechDocs Architecture
 When you deploy Backstage (with TechDocs enabled by default), you get a basic
 out-of-the box experience.
 
-<img data-zoomable src="../../assets/techdocs/architecture-basic.drawio.svg" alt="TechDocs Architecture diagram" />
+<!-- todo: Needs zoomable plugin -->
+
+![TechDocs Architecture diagram](../../assets/techdocs/architecture-basic.drawio.svg)
 
 > Note: See below for our recommended deployment architecture which takes care
 > of stability, scalability and speed. Also look at the
@@ -42,7 +44,9 @@ storage system (e.g. AWS S3, GCS or Azure Blob Storage). Read more in
 
 This is how we recommend deploying TechDocs in a production environment.
 
-<img data-zoomable src="../../assets/techdocs/architecture-recommended.drawio.svg" alt="TechDocs Architecture diagram" />
+<!-- todo: Needs zoomable plugin -->
+
+![TechDocs Architecture diagram](../../assets/techdocs/architecture-recommended.drawio.svg)
 
 The key difference in the recommended deployment approach is where the docs are
 built.

docs/features/techdocs/getting-started.md

@@ -89,11 +89,15 @@ const AppRoutes = () => {
 
 I know, you're curious to see how it looks, aren't you? See the image below:
 
-<img data-zoomable src="../../assets/techdocs/report-issue-addon.png" alt="TechDocs Report Issue Add-on" />
+<!-- todo: Needs zoomable plugin -->
+
+![TechDocs Report Issue Add-on](../../assets/techdocs/report-issue-addon.png)
 
 By clicking the open new issue button, you will be redirected to the new issue page according to the source code provider you are using:
 
-<img data-zoomable src="../../assets/techdocs/report-issue-template.png" alt="TechDocs Report Issue Template" />
+<!-- todo: Needs zoomable plugin -->
+
+![TechDocs Report Issue Template](../../assets/techdocs/report-issue-template.png)
 
 That's it! Now, we need the TechDocs Backend plugin for the frontend to work.