disable theme attribution

- I'll cover this in an article

config/_default/params.toml

@@ -37,7 +37,7 @@ forgejoDefaultServer = "https://v8.next.forgejo.org"
 [footer]
   showMenu = true
   showCopyright = true
-  showThemeAttribution = true
+  showThemeAttribution = false
   showAppearanceSwitcher = true
   showScrollToTop = true