DOCS: fix apidocs doesn't generate prefix on readthedocs

Author: Puerling

core/docs/python-api/API_Reference.rst

@@ -4,17 +4,17 @@ Full API reference
 .. toctree::
     :maxdepth: 4
 
-    spirit.chain            <apidoc/spirit.chain>
-    spirit.configuration    <apidoc/spirit.configuration>
-    spirit.constants        <apidoc/spirit.constants>
-    spirit.geometry         <apidoc/spirit.geometry>
-    spirit.hamiltonian      <apidoc/spirit.hamiltonian>
-    spirit.htst             <apidoc/spirit.htst>
-    spirit.io               <apidoc/spirit.io>
-    spirit.log              <apidoc/spirit.log>
-    spirit.parameters       <apidoc/spirit.parameters>
-    spirit.quantities       <apidoc/spirit.quantities>
-    spirit.simulation       <apidoc/spirit.simulation>
-    spirit.state            <apidoc/spirit.state>
-    spirit.system           <apidoc/spirit.system>
-    spirit.transition       <apidoc/spirit.transition>
+    spirit.chain            <apidoc/chain>
+    spirit.configuration    <apidoc/configuration>
+    spirit.constants        <apidoc/constants>
+    spirit.geometry         <apidoc/geometry>
+    spirit.hamiltonian      <apidoc/hamiltonian>
+    spirit.htst             <apidoc/htst>
+    spirit.io               <apidoc/io>
+    spirit.log              <apidoc/log>
+    spirit.parameters       <apidoc/parameters>
+    spirit.quantities       <apidoc/quantities>
+    spirit.simulation       <apidoc/simulation>
+    spirit.state            <apidoc/state>
+    spirit.system           <apidoc/system>
+    spirit.transition       <apidoc/transition>