fix: rename Clawd to Moltbot in WhatsApp screenshot

Updated the WhatsApp chat screenshot header from "Clawd" to "Moltbot"
to reflect the current project name. Also renamed the image file and
updated references in README.md and docs/index.md.

README.md

@@ -1,7 +1,7 @@
 # 🦞 Moltbot — Personal AI Assistant
 
 <p align="center">
-  <img src="https://raw.githubusercontent.com/moltbot/moltbot/main/docs/whatsapp-clawd.jpg" alt="Clawdbot" width="400">
+  <img src="https://raw.githubusercontent.com/moltbot/moltbot/main/docs/whatsapp-moltbot.jpg" alt="Moltbot" width="400">
 </p>
 
 <p align="center">

docs/index.md

@@ -8,7 +8,7 @@ read_when:
 > *"EXFOLIATE! EXFOLIATE!"* — A space lobster, probably
 
 <p align="center">
-  <img src="whatsapp-clawd.jpg" alt="Moltbot" width="420" />
+  <img src="whatsapp-moltbot.jpg" alt="Moltbot" width="420" />
 </p>
 
 <p align="center">