docs: update README and MCP integration guide to replace demo video format with MP4 for better compatibility and user experience

Author: DMontgomery40

README.md

@@ -62,8 +62,8 @@ Stdio “just works” tip
 - Set `FAX_BACKEND` to `phaxio` (cloud) or `sip` (self-hosted).
 - Use `X-API-Key` for auth; secure behind a reverse proxy for rate limiting.
 
-**Demo**
-<video src="assets/faxbot_demo.mov" width="100%" autoplay loop muted playsinline controls>
-  <a href="assets/faxbot_demo.mov">Download the demo video</a>
-  (Your browser does not support embedded videos.)
- </video>
+Demo
+<video src="assets/faxbot_demo.mp4" width="100%" autoplay loop muted playsinline controls>
+  <a href="assets/faxbot_demo.mp4">Watch the demo video</a>
+  (Your browser or GitHub may not inline-play videos; use the link.)
+</video>

assets/faxbot_demo.mp4

@@ -1,5 +1,11 @@
 # MCP_INTEGRATION.md
 
+Demo
+<video src="../assets/faxbot_demo.mp4" width="100%" autoplay loop muted playsinline controls>
+  <a href="../assets/faxbot_demo.mp4">Watch the demo video</a>
+  (Your browser or GitHub may not inline-play videos; use the link.)
+</video>
+
 Quick Start (Claude/Cursor)
 - Add Faxbot MCP to your assistant config (stdio). Then call send_fax with a local filePath.