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

Based on commit:

- a89b823f [mod] remove overpass API call

this patch is generated by::

     make themes.all

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

searx/static/themes/simple/css/searx-rtl.css

@@ -1,4 +1,4 @@
-/*! searx | 17-05-2021 | https://github.com/searxng/searxng */
+/*! searx | 01-06-2021 | https://github.com/searxng/searxng */
 /*
 * searx, A privacy-respecting, hackable metasearch engine
 *

searx/static/themes/simple/css/searx.css

@@ -1,4 +1,4 @@
-/*! searx | 17-05-2021 | https://github.com/searxng/searxng */
+/*! searx | 01-06-2021 | https://github.com/searxng/searxng */
 /*
 * searx, A privacy-respecting, hackable metasearch engine
 *