update site domain to thedataviewer.com

- update Live Demo link in README.md
- check about page for instances of old domain (none found)

Author: githyperplexed

README.md

@@ -1,6 +1,6 @@
 # Extension Data Viewer
 
-[Live Demo](https://extension-data-viewer.pages.dev/)
+[Live Demo](https://thedataviewer.com/)
 
 A web application built with <a href="https://kit.svelte.dev/" target="_blank" rel="noreferrer">SvelteKit</a> to view the data compiled in the <a href="https://docs.google.com/spreadsheets/d/1BQ93yboBqo6QUDhS9bVVOQLa48kcAiOZArmqQHbgNWU" target="_blank" rel="noreferrer">public Google Sheet</a> created by <a href="https://x.com/j3lte" target="_blank" rel="noreferrer">@j3lte</a>.