Update README.md: Mock document refinement

README.md

@@ -204,16 +204,16 @@ Running `quarkdown c file.qmd` will compile the given file and save the output t
 
 If you would like to familiarize yourself with Quarkdown instead, `quarkdown repl` lets you play with an interactive REPL mode.
 
-### Quickstart: mock document
+### Mock document
 
  
 
 <p align="center">
-  <img width="450" src="https://raw.githubusercontent.com/iamgio/quarkdown/project-files/images/mock-demo.png" alt="Mock document demo">
+  <img width="550" src="https://raw.githubusercontent.com/iamgio/quarkdown/project-files/images/mock-demo.png" alt="Mock document demo">
 </p>
 
 ***Mock***, written in Quarkdown, is a comprehensive collection of visual elements offered by the language,
-making it ideal for exploring and understanding its key features — all while playing with a concrete outcome in the form of pages or slides.
+making it ideal for exploring and understanding its key features — all while playing and experimenting hands-on with a concrete outcome in the form of pages or slides.
 
 The document's source files are available in the [`mock`](mock) directory, and can be compiled via `quarkdown c mock/main.qmd -p`.
 
@@ -270,7 +270,7 @@ Quarkdown comes with a set of themes that can give a unique look to your documen
 
 > [Theme contributions](core/src/main/resources/render/theme) are welcome!  
 > Please make sure they work well with all the three document types before submitting.  
-> The [Mock document](#quickstart-mock-document) is a great way to test.
+> The [Mock document](#mock-document) is a great way to test.
 
 ## Concept