fix(docs): update card links and descriptions for brainpy.state APIs

Author: chaoming0625

docs_classic/index.rst

@@ -113,11 +113,10 @@ Learn more
          :class-card: sd-text-black sd-bg-light
          :link: https://brainmodeling.readthedocs.io
 
-
    .. grid-item::
       :columns: 6 6 6 4
 
-      .. card:: :material-regular:`settings;2em` ``brainpy.state`` module
+      .. card:: :material-regular:`data_exploration;2em` ``brainpy.state`` APIs
          :class-card: sd-text-black sd-bg-light
          :link: https://brainpy-state.readthedocs.io/
 

docs_state/index.rst

@@ -116,6 +116,13 @@ Learn more
          :class-card: sd-text-black sd-bg-light
          :link: changelog.html
 
+   .. grid-item::
+      :columns: 6 6 6 4
+
+      .. card:: :material-regular:`data_exploration;2em` Classical APIs
+         :class-card: sd-text-black sd-bg-light
+         :link: https://brainpy.readthedocs.io/
+
 
 ----