docs: tweak gh readme video width

Author: machow

README.md

@@ -8,12 +8,16 @@ is designed as an alternative to
 Check out the below screencast for a walkthrough of creating a
 documentation site, or read on for instructions.
 
+<div width="50%">
+
 <div>
 
 [![](https://cdn.loom.com/sessions/thumbnails/fb4eb736848e470b8409ba46b514e2ed-00001.gif)](https://www.loom.com/share/fb4eb736848e470b8409ba46b514e2ed)
 
 </div>
 
+</div>
+
 <br>
 
 ## Installation

docs/get-started/overview.qmd

@@ -29,7 +29,9 @@ if "BUILDING_README" in os.environ:
     # I don't know why, but we need to repeat the Installation header here.
     # or quarto makes it disappear when we generate the readme
     print("""
+<div width="50%">
 [![](https://cdn.loom.com/sessions/thumbnails/fb4eb736848e470b8409ba46b514e2ed-00001.gif)](https://www.loom.com/share/fb4eb736848e470b8409ba46b514e2ed)
+</div>
 
 <br>