[Docs] Icon consistency. (#2895)

* Fix navbar brand (and work around annoying chromium bug).

https://issues.chromium.org/issues/41176872

* Update favicon to new logo.

* Update discord badges.

README.md

@@ -14,7 +14,7 @@
     <img src="https://dev.azure.com/discord-net/Discord.Net/_apis/build/status/discord-net.Discord.Net?branchName=dev" alt="Build Status">
   </a>
   <a href="https://discord.gg/dnet">
-    <img src="https://discord.com/api/guilds/848176216011046962/widget.png" alt="Discord">
+    <img src="https://img.shields.io/discord/848176216011046962?logo=discord&logoColor=white&label=discord&color=%235865F2" alt="Discord">
   </a>
 </p>
 Discord.Net is an unofficial .NET API Wrapper for the Discord API (https://discord.com).

docs/_template/material/public/main.css

@@ -74,7 +74,6 @@ img {
 
 /** NAVBAR **/
 .navbar-brand > img {
-  border-radius: 0;
   box-shadow: none;
   color: var(--bs-nav-link-color);
   margin-right: var(--bs-navbar-brand-margin-end);

docs/index.md

@@ -10,7 +10,7 @@ _layout: landing
 [![NuGet](https://img.shields.io/nuget/vpre/Discord.Net.svg?maxAge=2592000)](https://www.nuget.org/packages/Discord.Net)
 [![MyGet](https://img.shields.io/myget/discord-net/vpre/Discord.Net.svg)](https://www.myget.org/feed/Packages/discord-net)
 [![Build Status](https://dev.azure.com/discord-net/Discord.Net/_apis/build/status/discord-net.Discord.Net?branchName=dev)](https://dev.azure.com/discord-net/Discord.Net/_build/latest?definitionId=1&branchName=dev)
-[![Discord](https://discord.com/api/guilds/848176216011046962/widget.png)](https://discord.gg/dnet)
+[![Discord](https://img.shields.io/discord/848176216011046962?logo=discord&logoColor=white&label=discord&color=%235865F2)](https://discord.gg/dnet)
 
 ## What is Discord.NET?
 

docs/marketing/logo/SVG/Logomark Purple.svg

@@ -1,6 +1,6 @@
 <svg width="38" height="38" viewBox="0 0 38 38" fill="none" xmlns="http://www.w3.org/2000/svg">
 <g clip-path="url(#clip0_808_718)">
-<rect width="38" height="38" fill="white"/>
+<rect width="38" height="38" fill="transparent"/>
 <mask id="mask0_808_718" style="mask-type:luminance" maskUnits="userSpaceOnUse" x="-1" y="0" width="40" height="38">
 <path d="M38.6094 0H-0.571777V37.9667H38.6094V0Z" fill="white"/>
 </mask>