feat: New art: girl-manual

Author: segfaultxavi

source/index.rst

@@ -8,7 +8,7 @@
 
     - .. card:: getting-started/what-is-symbol.html resources/images/start-adventure.png START
     - .. card:: concepts/overview.html resources/images/assembly-line.png TECHNOLOGY
-    - .. card:: guides/index.html resources/images/book-stack.png GUIDES
+    - .. card:: guides/index.html resources/images/girl-manual.png GUIDES
     - .. card:: handbook/vision.html resources/images/symbolheart.png VISION
     - .. card:: contribute/index.html resources/images/XYMCity.png CONTRIBUTE
     - .. card:: handbook/index.html resources/images/handbook/welcome.png HANDBOOK