[static] make /stats more CSP compliant- make themes.all

Based on commits

- 0507e185 [fix] bar graph and rename CSS class engine-scores -> engine-score
- 3e9ad7ae [fix] make /stats more CSP compliant - github issue form
- 34859d0e [fix] make /stats more CSP compliant - oscar theme
- 0a6c4884 [fix] make /stats more CSP compliant - simple theme
- cdfb4b7f [fix] make /stats more CSP compliant - bar graph
- 965817f2 [fix] simple theme - generate missing sourceMap file

this patch is generated by::

     make themes.all

Reported-by: https://github.com/searxng/searxng/issues/57


Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>