added dynamic copyright year

if the param copyright contains the placeholder {year} the current year is returned

layouts/partials/footer.html

@@ -19,7 +19,7 @@
     {{/* Copyright */}}
     {{ if .Site.Params.footer.showCopyright | default true }}
     <p class="text-sm text-neutral-500 dark:text-neutral-400">
-      {{- with .Site.Params.copyright }}
+      {{- with replace .Site.Params.copyright "{year}" now.Year  }}
       {{ . | emojify | markdownify }}
       {{- else }}
       &copy;