Fix accessibility, frontmatter and string delimiter issues

- samples.md, use_cases.md: replace generic "alt text" with descriptive
  image alt texts for screen reader accessibility
- next.md: add missing frontmatter block (outline: [2, 4]) for consistency
  with all other documentation pages
- authorization.md: normalize string delimiters from single quotes to
  backticks in second AUTHORITY-CHECK example to match the rest of the file

https://claude.ai/code/session_01AaA4EMw83KMzGP6kaDZPJU

Author: claude

docs/configuration/authorization.md

@@ -85,8 +85,8 @@ CLASS z2ui5_cl_app IMPLEMENTATION.
 
   METHOD z2ui5_if_app~main.
     " Perform an authorization check before launching the app
-    AUTHORITY-CHECK OBJECT 'Z_APP_AUTH'
-                    ID 'APP' FIELD 'Z2UI5_APP_001'.
+    AUTHORITY-CHECK OBJECT `Z_APP_AUTH`
+                    ID `APP` FIELD `Z2UI5_APP_001`.
 
     IF sy-subrc <> 0.
       " Authorization failed, deny access

docs/get_started/next.md

@@ -1,3 +1,6 @@
+---
+outline: [2, 4]
+---
 # What's Next?
 
 Now that you have abap2UI5 up and running, here are some paths to explore further.

docs/get_started/samples.md

@@ -8,11 +8,11 @@ With over 250 samples, the [samples repository](https://github.com/abap2UI5/abap
 
 ### Samples
 Try out samples for tables, lists, trees, and many other UI5 controls. Copy and paste code snippets to accelerate your development:
-![alt text](image-1.png)
+![Sample apps overview showing tables, lists, trees and other UI5 controls](image-1.png)
 
 ### Jump into the Code
 Press `CTRL+F12` to open the source code, view, and model for each sample:
-![alt text](image-2.png)
+![Source code viewer opened with CTRL+F12 showing code, view and model](image-2.png)
 
 _Don't have a system available? You can also run the samples directly in your browser [here.](https://abap2ui5.github.io/web-abap2ui5-samples/)_
 

docs/get_started/use_cases.md

@@ -12,26 +12,26 @@ For a comprehensive overview, see [this article.](https://www.linkedin.com/pulse
 
 #### Tier 1 Extension
 For clean-core compliance, develop applications that follow "keep the core clean" principles, ensuring your apps stay cloud-ready and upgrade-stable:
-![alt text](image-11.png){ width=60% }
+![Tier 1 on-stack extension architecture diagram](image-11.png){ width=60% }
 
 #### Tier 2 Extension
 If certain APIs you need are not yet released, you can still create a cloud-ready abap2UI5 app by accessing these APIs through a separate Tier 2 wrapper:
-![alt text](image-21.png){ width=60% }
+![Tier 2 on-stack extension with wrapper for unreleased APIs](image-21.png){ width=60% }
 
 #### Tier 3 Extension
 For a classic extension approach, you can use unreleased APIs, giving you greater freedom to customize and extend your system:
-![alt text](image-10.png){ width=60% }
+![Tier 3 on-stack extension with unreleased API access](image-10.png){ width=60% }
 
 ### Side-by-Side Extension
 
 #### Tier 1 Extension
 Develop applications separately from your S/4 system's lifecycle using only remote API calls. Stick to released APIs and your apps will work with S/4HANA Public Cloud too:
-![alt text](image-22.png){ width=60% }
+![Tier 1 side-by-side extension with remote API calls](image-22.png){ width=60% }
 
 #### Tier 3 Extension
 For more flexibility, develop applications with an independent lifecycle from your S/4 system using remote API calls:
-![alt text](image-23.png){ width=60% }
+![Tier 3 side-by-side extension with remote API calls](image-23.png){ width=60% }
 
 ### Software as a Service
 With a Tier 1 side-by-side extension, you can connect the same abap2UI5 app to multiple S/4 systems. Use the same abap2UI5 code across different customer tenants and remote systems to create a true SaaS scenario:
-![alt text](image-9.png){ width=60% }
+![SaaS architecture connecting one abap2UI5 app to multiple S/4 tenants](image-9.png){ width=60% }