Re-levelization: move non-docs content, rename content→docs

For better URLs, the content folder has been renamed 'docs' and all
other files have been moved up a level. Also, non-docs images have been
moved to the static folder at the top level where they belong.

Many relative paths had to be fixed to make this work.

static/img/logos/twitch.svg

@@ -1,21 +1,7 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 23.0.6, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 2400 2800" style="enable-background:new 0 0 2400 2800;" xml:space="preserve">
-<style type="text/css">
-	.st0{fill:#FFFFFF;}
-	.st1{fill:#9146FF;}
-</style>
-<title>Asset 2</title>
-<g>
-	<polygon class="st0" points="2200,1300 1800,1700 1400,1700 1050,2050 1050,1700 600,1700 600,200 2200,200 	"/>
-	<g>
-		<g id="Layer_1-2">
-			<path class="st1" d="M500,0L0,500v1800h600v500l500-500h400l900-900V0H500z M2200,1300l-400,400h-400l-350,350v-350H600V200h1600
-				V1300z"/>
-			<rect x="1700" y="550" class="st1" width="200" height="600"/>
-			<rect x="1150" y="550" class="st1" width="200" height="600"/>
-		</g>
-	</g>
-</g>
+<svg width="50" height="50" viewBox="0 0 50 50" fill="none" xmlns="http://www.w3.org/2000/svg">
+<circle cx="25" cy="25" r="25" fill="#454549"/>
+<path d="M33.651 24.1071L30.0781 27.6786H26.5052L23.3789 30.8036V27.6786H19.3594V14.2857H33.651V24.1071Z" fill="white"/>
+<path d="M18.4661 12.5L14 16.9643V33.0357H19.3594V37.5L23.8255 33.0357H27.3984L35.4375 25V12.5H18.4661ZM33.651 24.1071L30.0781 27.6786H26.5052L23.3789 30.8036V27.6786H19.3594V14.2857H33.651V24.1071Z" fill="#9146FF"/>
+<path d="M30.9701 17.4106H29.1836V22.7678H30.9701V17.4106Z" fill="#9146FF"/>
+<path d="M26.0599 17.4106H24.2734V22.7678H26.0599V17.4106Z" fill="#9146FF"/>
 </svg>