Update preview link

Author: fxwiegand

src/config.yaml

@@ -30,7 +30,7 @@ hero:
   statements:
     - Create portable alignment plots from bam files
   links: 
-    - url: http://htmlpreview.github.io/?https://github.com/alignoth/alignoth/blob/main/examples/plot.html
+    - url: https://alignoth.github.io/preview.html
       text: Check Live Demo
 
 features:
@@ -39,7 +39,7 @@ features:
       Alignoth is a command line tool written in Rust for creating alignment plots from bam files. Plots are generated with vega-lite and can be embedded into html as well and standalone png, pdf or svg files using vega command line tools for rendering.
     img: bam-plot.svg
     img-width: min(30vw, 550px)
-    url: http://htmlpreview.github.io/?https://github.com/alignoth/alignoth/blob/main/examples/plot.html
+    url: https://alignoth.github.io/preview.html
 
 docs:
   src: docs