fix doc indexing on rtd

docs/_templates/layout.html

 {% extends "!layout.html" %}
 
 {%- block extrahead %}
-    <script type="text/javascript" src='/_static/jquery-3.2.1.min.js'></script>
+    <script type="text/javascript"
+						src={{ pathto('_static/jquery-3.2.1.min.js', 1) }}>
+		</script>
 {% endblock %}

docs/modules/callbacks.rst

@@ -5,7 +5,7 @@ tensorpack.callbacks package
 
     .. raw:: html
 
-        <script type="text/javascript" src='/_static/pymunk.js'></script>
+        <script type="text/javascript" src='../_static/pymunk.js'></script>
 
 
 .. automodule:: tensorpack.callbacks

docs/modules/dataflow.dataset.rst

@@ -5,7 +5,7 @@ tensorpack.dataflow.dataset package
 
     .. raw:: html
 
-        <script type="text/javascript" src='/_static/pymunk.js'></script>
+        <script type="text/javascript" src='../../_static/pymunk.js'></script>
 
 
 .. automodule:: tensorpack.dataflow.dataset

docs/modules/dataflow.imgaug.rst

@@ -5,7 +5,7 @@ tensorpack.dataflow.imgaug package
 
     .. raw:: html
 
-        <script type="text/javascript" src='/_static/pymunk.js'></script>
+        <script type="text/javascript" src='../../_static/pymunk.js'></script>
 
 .. automodule:: tensorpack.dataflow.imgaug
     :members:

docs/modules/dataflow.rst

@@ -12,7 +12,7 @@ Table of Contents
 
     .. raw:: html
 
-        <script type="text/javascript" src='/_static/pymunk.js'></script>
+        <script type="text/javascript" src='../_static/pymunk.js'></script>
 
 
 DataFlow

docs/modules/models.rst

@@ -5,7 +5,7 @@ tensorpack.models package
 
     .. raw:: html
 
-        <script type="text/javascript" src='/_static/pymunk.js'></script>
+        <script type="text/javascript" src='../_static/pymunk.js'></script>
 
 
 .. automodule:: tensorpack.models