doc: organize into doc/resources/, keep front-page docs at doc/

doc/ellie.md

@@ -45,7 +45,7 @@ Opens the session tree (`*ellie-sessions*`), attached to the last-known
 session for your working directory if it still exists.
 
 <p align="center">
-  <a href="img/ellie.png"><img src="img/ellie.png" alt="ellie Emacs interface showing the Ollie session tree and chat window" width="75%"></a>
+  <a href="resources/img/ellie.png"><img src="resources/img/ellie.png" alt="ellie Emacs interface showing the Ollie session tree and chat window" width="75%"></a>
 </p>
 
 ## Session tree

doc/kde-gui.md

@@ -3,7 +3,7 @@
 ollie-gui is a free-standing Qt6/QML desktop application that talks to an ollie session directly through `ollie-9p`. No D-Bus, no Plasma dependencies — it runs on any Linux desktop with Qt6 installed.
 
 <p align="center">
-  <a href="img/ollie-kde.png"><img src="img/ollie-kde.png" alt="Ollie KDE GUI window showing a session tree, chat history, and prompt input bar with KDE Plasma Breeze theme" width="75%"></a>
+  <a href="resources/img/ollie-kde.png"><img src="resources/img/ollie-kde.png" alt="Ollie KDE GUI window showing a session tree, chat history, and prompt input bar with KDE Plasma Breeze theme" width="75%"></a>
 </p>
 
 ## Prerequisites