Add option to toggle footer theme name display

- Introduced `footerThemeName` parameter in `hugo.toml.example` to control the display of Hugo and Hermit-V2 theme tribute in the footer.
 - Updated `footer.html` to conditionally display the tribute based on the `footerThemeName` parameter.

hugo.toml.example

@@ -90,6 +90,8 @@ expiryDate = ["expiryDate"]
 
   #homeSubtitle = "CHANGE ME HOME SUBTITLE"
   footerCopyright = "CHANGE ME FOOTER COPYRIGHT"
+  # Whether to show a tribute to hugo and hermit-v2 theme
+  footerThemeName = true
   # bgImg = ""
   # gitUrl = "https://github.com/1bl4z3r/hermit-V2/tree/staging"