Remove redundant PyTorch logo assets (#2824)

Summary:
PyTorch logo is included in pytorch doc theme, (and cannot be changed without custom CSS) so no need to have them here.

Pull Request resolved: https://github.com/pytorch/audio/pull/2824

Reviewed By: carolineechen

Differential Revision: D40954564

Pulled By: mthrok

fbshipit-source-id: 5e9a91fddcc92c141baf1996f721c09c037fb003

docs/source/_static/img/pytorch-logo-dark.svg

-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 22.1.0, 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 0 199.7 40.2" style="enable-background:new 0 0 199.7 40.2;" xml:space="preserve">
-<style type="text/css">
-	.st0{fill:#EE4C2C;}
-	.st1{fill:#252525;}
-</style>
-<g>
-	<path class="st0" d="M40.8,9.3l-2.1,2.1c3.5,3.5,3.5,9.2,0,12.7c-3.5,3.5-9.2,3.5-12.7,0c-3.5-3.5-3.5-9.2,0-12.7l0,0l5.6-5.6
-		L32.3,5l0,0V0.8l-8.5,8.5c-4.7,4.7-4.7,12.2,0,16.9s12.2,4.7,16.9,0C45.5,21.5,45.5,13.9,40.8,9.3z"/>
-	<circle class="st0" cx="36.6" cy="7.1" r="1.6"/>
-</g>
-<g>
-	<g>
-		<path class="st1" d="M62.6,20l-3.6,0v9.3h-2.7V2.9c0,0,6.3,0,6.6,0c7,0,10.3,3.4,10.3,8.3C73.2,17,69.1,19.9,62.6,20z M62.8,5.4
-			c-0.3,0-3.9,0-3.9,0v12.1l3.8-0.1c5-0.1,7.7-2.1,7.7-6.2C70.4,7.5,67.8,5.4,62.8,5.4z"/>
-		<path class="st1" d="M85.4,29.2l-1.6,4.2c-1.8,4.7-3.6,6.1-6.3,6.1c-1.5,0-2.6-0.4-3.8-0.9l0.8-2.4c0.9,0.5,1.9,0.8,3,0.8
-			c1.5,0,2.6-0.8,4-4.5l1.3-3.4L75.3,10h2.8l6.1,16l6-16h2.7L85.4,29.2z"/>
-		<path class="st1" d="M101.9,5.5v23.9h-2.7V5.5h-9.3V2.9h21.3v2.5H101.9z"/>
-		<path class="st1" d="M118.8,29.9c-5.4,0-9.4-4-9.4-10.2c0-6.2,4.1-10.3,9.6-10.3c5.4,0,9.3,4,9.3,10.2
-			C128.3,25.8,124.2,29.9,118.8,29.9z M118.9,11.8c-4.1,0-6.8,3.3-6.8,7.8c0,4.7,2.8,7.9,6.9,7.9s6.8-3.3,6.8-7.8
-			C125.8,15,123,11.8,118.9,11.8z"/>
-		<path class="st1" d="M135,29.4h-2.6V10l2.6-0.5v4.1c1.3-2.5,3.2-4.1,5.7-4.1c1.3,0,2.5,0.4,3.4,0.9l-0.7,2.5
-			c-0.8-0.5-1.9-0.8-3-0.8c-2,0-3.9,1.5-5.5,5V29.4z"/>
-		<path class="st1" d="M154.4,29.9c-5.8,0-9.5-4.2-9.5-10.2c0-6.1,4-10.3,9.5-10.3c2.4,0,4.4,0.6,6.1,1.7l-0.7,2.4
-			c-1.5-1-3.3-1.6-5.4-1.6c-4.2,0-6.8,3.1-6.8,7.7c0,4.7,2.8,7.8,6.9,7.8c1.9,0,3.9-0.6,5.4-1.6l0.5,2.4
-			C158.7,29.3,156.6,29.9,154.4,29.9z"/>
-		<path class="st1" d="M176.7,29.4V16.9c0-3.4-1.4-4.9-4.1-4.9c-2.2,0-4.4,1.1-6,2.8v14.7h-2.6V0.9l2.6-0.5c0,0,0,12.1,0,12.2
-			c2-2,4.6-3.1,6.7-3.1c3.8,0,6.1,2.4,6.1,6.6v13.3H176.7z"/>
-	</g>
-</g>
-</svg>

docs/source/conf.py

@@ -202,8 +202,6 @@ html_theme_options = {
     "analytics_id": "UA-117752657-2",
 }
 
-html_logo = "_static/img/pytorch-logo-dark.svg"
-
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".