Remove unused navbarlogoshow parameter (scientific-python#212)

See
scientific-python/scientific-python-hugo-theme#564 and
https://github.com/scientific-python/scientific-python-hugo-theme/pull/564/files#diff-bc05cf732e6bc1bd23d754c953ccf383cf7afeaba11f293941603d234fb6ce5b

Author: jarrodmillman

config.yaml

@@ -47,8 +47,6 @@ params:
     text: Scientific Python Blog
     link: /
 
-  navbarlogoshow: true
-
   navbar:
     - title: Home
       url: https://scientific-python.org