chore: remove Discord references from docs

Remove Discord links from homepage, navbar, footer, and associated CSS.

Author: gricha

docs/docusaurus.config.ts

@@ -95,12 +95,6 @@ const config: Config = {
           position: 'left',
           label: 'Docs',
         },
-        {
-          href: 'https://discord.gg/s2KX8kTvGX',
-          position: 'right',
-          className: 'header-discord-link',
-          'aria-label': 'Discord server',
-        },
         {
           href: 'https://github.com/gricha/perry',
           position: 'right',
@@ -132,10 +126,6 @@ const config: Config = {
         {
           title: 'Community',
           items: [
-            {
-              label: 'Discord',
-              href: 'https://discord.gg/s2KX8kTvGX',
-            },
             {
               label: 'GitHub',
               href: 'https://github.com/gricha/perry',

docs/src/css/custom.css

@@ -689,19 +689,3 @@ td code {
   opacity: 0.7;
 }
 
-.header-discord-link::before {
-  content: '';
-  width: 24px;
-  height: 24px;
-  display: flex;
-  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 127.14 96.36'%3E%3Cpath fill='%23000000' d='M107.7,8.07A105.15,105.15,0,0,0,81.47,0a72.06,72.06,0,0,0-3.36,6.83A97.68,97.68,0,0,0,49,6.83,72.37,72.37,0,0,0,45.64,0,105.89,105.89,0,0,0,19.39,8.09C2.79,32.65-1.71,56.6.54,80.21h0A105.73,105.73,0,0,0,32.71,96.36,77.7,77.7,0,0,0,39.6,85.25a68.42,68.42,0,0,1-10.85-5.18c.91-.66,1.8-1.34,2.66-2a75.57,75.57,0,0,0,64.32,0c.87.71,1.76,1.39,2.66,2a68.68,68.68,0,0,1-10.87,5.19,77,77,0,0,0,6.89,11.1A105.25,105.25,0,0,0,126.6,80.22h0C129.24,52.84,122.09,29.11,107.7,8.07ZM42.45,65.69C36.18,65.69,31,60,31,53s5-12.74,11.43-12.74S54,46,53.89,53,48.84,65.69,42.45,65.69Zm42.24,0C78.41,65.69,73.25,60,73.25,53s5-12.74,11.44-12.74S96.23,46,96.12,53,91.08,65.69,84.69,65.69Z'/%3E%3C/svg%3E") no-repeat center center;
-  background-size: 24px 24px;
-}
-
-[data-theme='dark'] .header-discord-link::before {
-  filter: invert(1);
-}
-
-.header-discord-link:hover {
-  opacity: 0.7;
-}

docs/src/pages/index.tsx

@@ -31,11 +31,6 @@ function HomepageHeader() {
             to="https://github.com/gricha/perry">
             GitHub
           </Link>
-          <Link
-            className="button button--secondary button--lg"
-            to="https://discord.gg/s2KX8kTvGX">
-            Discord
-          </Link>
         </div>
         <div className={styles.terminalBlock}>
           <div className={styles.terminalLine}>