feat(seo.html): add meta tags for site verification codes (Google, Bing, Yandex, Pinterest, Baidu, So, Sogou) to improve SEO and site ownership verification

feat(analytics.html): create partial to include analytics scripts for various analytics services (Google Analytics, Fathom Analytics, Baidu Analytics, Umami Analytics, Plausible Analytics, Cloudflare Analytics, Splitbee Analytics) to track website traffic and user behavior

layouts/_default/baseof.html

@@ -13,5 +13,8 @@
       {{- block "main" . -}}
       {{- end -}}
     </div>
+    <div class="analytics">
+      {{- partial "plugin/analytics.html" . -}}
+    </div>
   </body>
 </html>

layouts/partials/head/seo.html

@@ -0,0 +1,21 @@
+{{- with site.Params.verification.google -}}
+  <meta name="google-site-verification" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.bing -}}
+  <meta name="msvalidate.01" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.yandex -}}
+  <meta name="yandex-verification" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.pinterest -}}
+  <meta name="p:domain_verify" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.baidu -}}
+  <meta name="baidu-site-verification" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.sogou -}}
+  <meta name="sogou_site_verification" content="{{ . }}" />
+{{- end -}}
+{{- with site.Params.verification.so -}}
+  <meta name="360-site-verification" content="{{ . }}" />
+{{- end -}}

layouts/partials/plugin/analytics.html

@@ -0,0 +1,84 @@
+{{- $analytics := site.Params.analytics -}}
+
+{{- if $analytics.enable -}}
+  {{- /* Google Analytics */ -}}
+  {{- with $analytics.google.id -}}
+        <script type="text/javascript">
+            window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag('js', new Date());
+            gtag('config', '{{ . }}'{{ if $analytics.google.anonymizeIP }}, { 'anonymize_ip': true }{{ end }});
+        </script> {{- printf "https://www.googletagmanager.com/gtag/js?id=%v" . | dict "Async" true "Source" | partial "plugin/script.html" -}}
+  {{- end -}}
+
+  {{- /* Fathom Analytics */ -}}
+  {{- with $analytics.fathom.id -}}
+        <script type="text/javascript">
+            window.fathom=window.fathom||function(){(fathom.q=fathom.q||[]).push(arguments);};
+            fathom('set', 'siteId', '{{ . }}');
+            fathom('trackPageview');
+        </script> {{- dict "Source" ($analytics.fathom.server | default "cdn.usefathom.com" | printf "https://%v/tracker.js") "Async" true "Attr" "id=fathom-script" | partial "plugin/script.html" -}}
+  {{- end -}}
+
+  {{- /* Baidu Analytics */ -}}
+  {{- with $analytics.baidu.id -}}
+		<script>
+			var _hmt = _hmt || [];
+			(function() {
+			  var hm = document.createElement("script");
+			  hm.src = "https://hm.baidu.com/hm.js?{{ . }}";
+			  var s = document.getElementsByTagName("script")[0];
+			  s.parentNode.insertBefore(hm, s);
+			})();
+		</script>
+  {{- end -}}
+
+  {{- /* Umami Analytics */ -}}
+  {{- with $analytics.umami.data_website_id -}}
+    <script
+      async
+      defer
+      data-website-id="{{ . }}"
+      src="{{ $analytics.umami.src }}"
+      {{ with $analytics.umami.data_host_url }}data-host-url="{{ . }}"{{ end }}
+      {{ with $analytics.umami.data_domains }}data-domains="{{ . }}"{{ end }}
+    ></script>
+  {{- end -}}
+
+  {{- /* Plausible Analytics */ -}}
+  {{- with $analytics.plausible.data_domain -}}
+    <script
+      async
+      defer
+      data-domain="{{ . }}"
+      src="{{ $analytics.plausible.src }}"
+    ></script>
+  {{- end -}}
+
+  {{- /* Cloudflare Analytics */ -}}
+  {{- with $analytics.cloudflare.token -}}
+    <script
+      defer
+      src="https://static.cloudflareinsights.com/beacon.min.js"
+      data-cf-beacon='{"token": "{{ $analytics.cloudflare.token }}"}'
+    ></script>
+  {{- end -}}
+
+  {{- /* Splitbee Analytics */ -}}
+  {{- if $analytics.splitbee.enable -}}
+    {{- $attr := "" -}}
+    {{- if $analytics.splitbee.Do_not_track -}}
+      {{- $attr = printf `%v data-respect-dnt` $attr -}}
+    {{- end -}}
+    {{- if $analytics.splitbee.No_cookie -}}
+      {{- $attr = printf `%v data-no-cookie` $attr -}}
+    {{- end -}}
+    {{- with $analytics.splitbee.data_token -}}
+      {{- $attr = printf `%v data-token="%v"` $attr . -}}
+    {{- end -}}
+    <script
+      defer
+      {{ with $attr }}{{ . | safeHTMLAttr }}{{ end }}
+      src="https://cdn.splitbee.io/sb.js"
+    ></script>
+  {{- end -}}
+
+{{- end -}}