Enable llms.txt generation in docs

Author: koperagen

docs/StardustDocs/cfg/buildprofiles.xml

@@ -17,6 +17,7 @@
         <enable-browser-edits>true</enable-browser-edits>
         <browser-edits-url>https://github.com/Kotlin/dataframe/edit/master/docs/StardustDocs/</browser-edits-url>
         <include-in-head>include-head.html</include-in-head>
+        <llms-txt single-file="true"/>
     </variables>
     <sitemap change-frequency="monthly"/>
     <build-profile instance="d">