update image links

Author: wang0618

demos/index.py

@@ -25,19 +25,19 @@
 **Screenshots**
 
 <a href="{charts_demo_host}/?app=bokeh">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/bokeh.png" alt="bokeh demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/bokeh.png" alt="bokeh demo">
 </a>
 
 <a href="{charts_demo_host}/?app=plotly">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/plotly.png" alt="plotly demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/plotly.png" alt="plotly demo">
 </a>
 
 <a href="{charts_demo_host}/?app=pyecharts">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/pyecharts.gif" alt="pyecharts demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/pyecharts.gif" alt="pyecharts demo">
 </a>
 
 <a href="{charts_demo_host}/?app=cutecharts">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/cutecharts.png" alt="cutecharts demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/cutecharts.png" alt="cutecharts demo">
 </a>
 
 ### Links
@@ -69,19 +69,19 @@
 **数据可视化demo截图**
 
 <a href="{charts_demo_host}/?app=bokeh">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/bokeh.png" alt="bokeh demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/bokeh.png" alt="bokeh demo">
 </a>
 
 <a href="{charts_demo_host}/?app=plotly">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/plotly.png" alt="plotly demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/plotly.png" alt="plotly demo">
 </a>
 
 <a href="{charts_demo_host}/?app=pyecharts">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/pyecharts.gif" alt="pyecharts demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/pyecharts.gif" alt="pyecharts demo">
 </a>
 
 <a href="{charts_demo_host}/?app=cutecharts">
-    <img src="https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/cutecharts.png" alt="cutecharts demo">
+    <img src="https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery/assets/cutecharts.png" alt="cutecharts demo">
 </a>
 
 ### Links

demos/theme.py

@@ -348,7 +348,7 @@ def page():
 
     put_markdown('# Switch Theme')
     themes = [
-        put_image(f"https://cdn.jsdelivr.net/gh/wang0618/PyWebIO@dev/docs/assets/theme/{name}.png").onclick(
+        put_image(f"https://fastly.jsdelivr.net/gh/wang0618/PyWebIO@dev/docs/assets/theme/{name}.png").onclick(
             partial(go_app, name=name, new_window=False))
         for name in ALL_THEME if name != theme
     ]

docs/libraries_support.rst

@@ -64,7 +64,7 @@ In PyWebIO, you can also use ``bokeh.io.show()`` to display a Bokeh App. For the
 
 .. note:: Bokeh App currently is only available in the default Tornado backend
 
-.. image:: https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/bokeh.png
+.. image:: https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/bokeh.png
 
 pyecharts
 ^^^^^^^^^^^^^^^^^^^^^^
@@ -80,7 +80,7 @@ See related demo on :charts_demo_host:`pyecharts demo </?app=pyecharts>`
 
 .. only:: not latex
 
-    .. image:: https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/pyecharts.gif
+    .. image:: https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/pyecharts.gif
 
 plotly
 ^^^^^^^^^^^^^^^^^^^^^^
@@ -95,7 +95,7 @@ In PyWebIO, you can use the following code to output the plotly chart instance::
 
 See related demo on :charts_demo_host:`plotly demo </?app=plotly>`
 
-.. image:: https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/plotly.png
+.. image:: https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/plotly.png
 
 pyg2plot
 ^^^^^^^^^^^^^^^^^^^^^^
@@ -121,4 +121,4 @@ In PyWebIO, you can use the following code to output the cutecharts.py chart ins
 
 See related demo on :charts_demo_host:`cutecharts demo </?app=cutecharts>`
 
-.. image:: https://cdn.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/cutecharts.png
+.. image:: https://fastly.jsdelivr.net/gh/wang0618/pywebio-chart-gallery@master/assets/cutecharts.png