Improve the references to the local fonts

src:url() only accepts format(), not type().
Source: https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/src
This should improve rendering of fonts via webserver.
Fixing this uncovered another issue: if src:url is correctly specified,
Firefox attempts to load the fonts from that url, rather than look for
the local font first. To achieve the correct lookup order,
src:local() should be defined before the url.
Firefox then loads from the first found location.

python-sphinx_rtd_theme.spec

@@ -104,8 +104,11 @@ for FONT in lato-normal=lato/Lato-Regular.ttf \
 do
   L="${FONT%=*}"
   R="${FONT#*=}"
+  # Get the font basename from the path
+  F="${R#*/}"
+  F_BASENAME="${F/.ttf}"
   sed \
-    -e "s|src:\(url(fonts/$L\.[^)]*) format([^)]*),\?\)\+|src:url('/.sysassets/fonts/$R') type(\"truetype\")|g" \
+    -e "s|src:\(url(fonts/$L\.[^)]*) format([^)]*),\?\)\+|src:local('$F_BASENAME'),url('/.sysassets/fonts/$R') format(\"truetype\")|g" \
     -i theme.css
 done
 
@@ -188,6 +191,7 @@ grep 'format("woff2\?")' \
 %changelog
 * Fri Jul 01 2022 Karolina Surma <ksurma@redhat.com> - 1.0.0-7
 - Relax the python-docutils version requirement to <0.19
+- Improve references to system fonts (needed by Firefox)
 
 * Mon Jun 13 2022 Python Maint <python-maint@redhat.com> - 1.0.0-6
 - Rebuilt for Python 3.11