Fix mathjax on website broken due to https

The dealii.org webserver now tries to serve https sites. This breaks mathjax because of:

Mixed Content: The page at 'https://www.dealii.org/developer/doxygen/deal.II/step_31.html' was loaded over HTTPS, but requested an insecure resource 'http://cdn.mathjax.org/mathjax/latest/MathJax.js'. This request has been blocked;

This commit fixes this by loading it over https.

diff --git a/doc/doxygen/options.dox.in b/doc/doxygen/options.dox.in
index 2570ae85e5a6de366546b5f357fbc65a128b35ba..34513c48803130f1bb4bce5e8900878d9a75e343 100644 (file)
--- a/doc/doxygen/options.dox.in
+++ b/doc/doxygen/options.dox.in
@@ -111,7 +111,7 @@ HTML_FILE_EXTENSION    = .html
 HTML_HEADER            = header.html
 HTML_FOOTER            = footer.html
 USE_MATHJAX            = @_use_mathjax@
-MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_RELPATH        = https://cdn.mathjax.org/mathjax/latest
 MATHJAX_EXTENSIONS     = TeX/AMSmath TeX/AMSsymbols
 HTML_COLORSTYLE_HUE    = 220
 HTML_COLORSTYLE_SAT    = 200