docs(netlify.toml): Fix Netlify URL path issues for deploy previews (#544)

netlify.toml

@@ -14,6 +14,11 @@
   YARN_FLAGS = "--no-ignore-optional --pure-lockfile"
 
 # COMMENT: This a rule for Single Page Applications
+[[redirects]]
+  from = "/demo/*"
+  to = "/demo/index.html"
+  status = 200
+
 [[redirects]]
   from = "/*"
   to = "/index.html"