doc: fix headings and broken image reference (#464)

* First (and only) H1 heading should be the document title
* image reference was broken

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

Author: dbkinder

SearchQnA/docker/ui/svelte/README.md

@@ -2,7 +2,7 @@
 
 ## 📸 Project Screenshots
 
-![project-screenshot](../../assets/img/search_ui_init.png)
+![project-screenshot](../../../assets/img/search_ui_init.png)
 
 ## 🧐 Features