Enable inverting homepage section styling

Add invert Param to the config file. Add the 'odd' class to the
post-holders and the 'even' class to the post-afters using Hugo if
statements instead of using JS. Marking invert = true in the config file
flips which sections are marked odd and even.

exampleSite/config.toml

@@ -44,6 +44,9 @@ title = "Jane Doe - Nutrition Coach & Chef Consultant"
     # This theme will, by default, inject a design-by-line at the bottom of the page.
     # You can turn it off, but we would really appreciate if you don’t :-)
     hidedesignbyline = false
+
+    # The sections of the home page alternate styling. Mark invert as true to swap the styling of the sections
+    invert = false
     
     [params.meta]
         keywords = "some, keywords, for, seo, you, know, google, duckduckgo, and, such"