replaced some more icons with svg

src/en/contact.html

@@ -14,7 +14,7 @@ eleventyNavigation:
 <div class="row justify-content-center">
     <div class="col-12 col-md-10 col-lg-8">
         <a class="card mb-3 d-flex align-items-center text-decoration-none" href="mailto:mail@sp-codes.de">
-            <div class="pr-3"><span class="fas fa-fw fa-4x fa-envelope text-foreground"></span></div>
+            <div class="pr-3"><span class="si si-envelope si-4x"></span></div>
             <div>Send me an email to <strong>mail@sp-codes.de</strong></div>
         </a>
         <a class="card mb-3 d-flex align-items-center text-decoration-none"

src/en/services/connectivitycheck.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: connectivitycheck
 title: Captive Portal Check
 ---
-# <i class="fas fa-wifi"></i> Captive Portal Check
+# <i class="si si-wifi"></i> Captive Portal Check
 
 A captive portal is a login page in public WLAN networks to restrict Internet access to the approval of certain terms of use. When you see a login page on a public network, your device uses a captive portal check. This allows the device to find out whether you have direct Internet access or not. In Android, for example, your device sends a request to a Google server.
 

src/en/services/firefox-sync.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: firefox-sync
 title: Firefox Sync
 ---
-# <i class="fab fa-firefox-browser"></i> Firefox Sync
+# <i class="si si-firefox-browser"></i> Firefox Sync
 
 Do you use Firefox on more than one device for surfing? Then Firefox Sync lets you synchronize your browser data (bookmarks, open tabs, search history, and more) between all your devices.
 

src/en/services/invidious.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: invidious
 title: Invidious
 ---
-# <i class="fab fa-youtube"></i> Invidious
+# <i class="si si-youtube"></i> Invidious
 
 Invidious is an alternative YouTube-Frontend. It establishes only the most necessary connections to YouTube and many of them are even made by the server itself. So Invidious increases the privacy of the users.
 

src/en/services/nitter.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: nitter
 title: Nitter
 ---
-# <i class="fab fa-twitter"></i> Nitter
+# <i class="si si-twitter"></i> Nitter
 
 A free and open source Twitter frontend that is focussed on user privacy. Connections to Twitter are handled by the server itself to prevent tracking by IP or JavaScript.
 

src/en/services/searx.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: searx
 title: Searx
 ---
-# <i class="fas fa-search"></i> Searx
+# <i class="si si-search"></i> Searx
 
 Searx is a free meta search engine, which uses other public search engines like Google, DuckDuckGo, StartPage and many others.
 

src/en/services/shields.md

@@ -3,7 +3,7 @@ layout: base.njk
 key: shields
 title: Shields
 ---
-# <i class="fas fa-tags"></i> Shields
+# <i class="si si-tags"></i> Shields
 
 Shields is a service for concise, consistent and legible badges in SVG and raster format. Via a URL they can be easily embedded in readmes or any other website. In addition, integrations to various services or networks are provided.