refactor: rename article-footer to article-meta (#1293)

* refactor: rename `article-footer` to `article-meta`, and remove unnecesary structures

* fix: Update default article license URL to point to Creative Commons.

layouts/_partials/article/components/footer.html

@@ -1,15 +1,15 @@
-<footer class="article-footer">
+<footer class="article-meta article-footer">
     {{ partial "article/components/tags" . }}
 
     {{ if and (.Site.Params.article.license.enabled) (not (eq .Params.license false)) }}
-    <section class="article-copyright">
+    <section class="article-copyright inline-meta">
         {{ partial "helper/icon" "copyright" }}
         <span>{{ default .Site.Params.article.license.default .Params.license | markdownify }}</span>
     </section>
     {{ end }}
 
     {{- if ne .Lastmod .Date -}}
-    <section class="article-lastmod">
+    <section class="article-lastmod inline-meta">
         {{ partial "helper/icon" "clock" }}
         <span>
             {{ T "article.lastUpdatedOn" }} {{ .Lastmod | time.Format .Site.Params.dateFormat.lastUpdated }}