Add video hosting platforms category (#1974)

_includes/sections/decentralized-video.html

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+<h1 id="video" class="anchor"><a href="#video"><i class="fas fa-link anchor-icon"></i></a> Decentralized Video Platforms</h1>
+
+<div class="alert alert-warning" role="alert">
+  <strong> If you are currently using a platform like YouTube or Vimeo, you should pick an alternative here.</strong>
+</div>
+
+{% include cardv2.html
+  title="PeerTube"
+  image="/assets/img/svg/3rd-party/peertube.svg"
+  description='PeerTube, developed by Framasoft, is a free and decentralized alternative to video platforms, with over 400,000 videos published by over 50,000 users and viewed over 10 million times. If you are looking for a server to join, you are welcome to join our hosted instance: <a href="https://tube.privacytools.io/">tube.privacytools.io</a>'
+  website="https://joinpeertube.org"
+  github="https://github.com/Chocobozzz/PeerTube"
+  web="https://joinpeertube.org/#what-is-peertube"
+%}

_includes/sections/video-frontends.html

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+<h1 id="proxies" class="anchor"><a href="#proxies"><i class="fas fa-link anchor-icon"></i></a> Frontends and Proxies</h1>
+
+<div class="alert alert-warning" role="alert">
+  <strong> If you are currently using a platform like YouTube, you can keep watching videos without sharing your IP.</strong>
+</div>
+
+{% include cardv2.html
+  title="Invidious"
+  image="/assets/img/svg/3rd-party/invidious.svg"
+  description='Invidious is an alternative front-end to YouTube. It is free software, with no advertising or Javascript dependency to play videos, with lots of other features that allow you to have a complete YouTube experience, sans Google.'
+  website="https://invidio.us"
+  github="https://github.com/omarroth/invidious"
+  web="https://instances.invidio.us"
+%}