Docs updates incl. Polars (#827)

This PR makes the following aesthetic and content updates to the docs.

- [x] Fix max width issue on mobile: Content should now render more
cleanly and be more readable on smaller devices
- [x] Improve image quality of flowchart in data management page
- [x] Fix syntax highlighting in text at the bottom of the IVF-PQ
concepts page
- [x] Add example of Polars LazyFrames to docs (Integrations)
- [x] Add example of adding data to tables using Polars (guides)

docs/src/styles/extra.css

@@ -11,11 +11,12 @@
 
 /* grid */
 .md-grid {
-    max-width: 80%;
+    max-width: 95%;
   }
   
   @media (min-width: 1220px) {
     .md-main__inner {
+      max-width: 80%;
       margin-top: 0;
     }
     .md-sidebar {