Add analytics template + Add Ko-Fi donation button + Host fonts locally (#530)

* Add Blogtrottr as newsletter provider

* Fixed absLangURL issue with sections in footer

* Fixes LaTeX support

Makes scripts fully local and only loads them if math:true. Adds support for 18462\latex18462 or even $\latex$

* Added 2 New, Privacy-Friendly Analytics Methods

Counter.dev and GoatAnalytics. Google Analytics should keep working the same

* Removed 1 CDN

* Moved params under features

* Added Ko-Fi floating button for support

* Refactor analytics code + Add local fonts

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

Co-authored-by: Pablo Marcos <codebergflamingo@staplehorse.anonaddy.com>
Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

layouts/partials/analytics.html

@@ -0,0 +1,46 @@
+<!-- Add Analytics if enabled in configuration -->
+{{ with site.Params.features.analytics }}
+    {{ if .enabled }}
+        <!-- Google Analytics -->
+        {{ with .google }}
+            {{ $privacyConfig:= dict (slice "Site" "Config" "Privacy" "GoogleAnalytics") $.Site.Config.Privacy.GoogleAnalytics }}
+            {{ $analyticsConfig := dict (slice "Site" "GoogleAnalytics") .id }}
+            {{ template "_internal/google_analytics.html" (merge $privacyConfig $analyticsConfig) }}
+        {{ end }}
+
+        <!-- Counter.dev -->
+        {{ with .counterDev }}
+            <script>
+            if (
+                !sessionStorage.getItem("_swa") &&
+                document.referrer.indexOf(location.protocol + "//" + location.host) !== 0
+            ) {
+                fetch(
+                "https://counter.dev/track?" +
+                    new URLSearchParams({
+                    referrer: document.referrer,
+                    screen: screen.width + "x" + screen.height,
+                    user: "{{ .id }}",
+                    utcoffset: "1",
+                    })
+                );
+            }
+            sessionStorage.setItem("_swa", "1");
+            </script>
+        {{ end }}
+
+        <!-- GoatCounter -->
+        {{ with .goatCounter }}
+            <script
+            data-goatcounter="https://{{ .code }}.goatcounter.com/count"
+            async
+            src="//gc.zgo.at/count.js"
+            ></script>
+        {{ end }}
+    {{ end }}
+{{ end }}
+
+<!-- Keep backwards compatibility and consistency with HUGO defaults -->
+{{ if site.GoogleAnalytics }}
+    {{ template "_internal/google_analytics.html" . }}
+{{ end }}