Remove unnecessary class and change text-dark color

src/app/components/plugin-manager-component.js

@@ -196,7 +196,7 @@ class PluginManagerComponent extends ViewPlugin {
       <div id='pluginManager'>
         <header class="form-group ${css.pluginSearch} plugins-header py-3 px-4 border-bottom">
           <input onkeyup="${e => this.filterPlugins(e)}" class="${css.pluginSearchInput} form-control" placeholder="Search">
-          <button onclick="${_ => this.openLocalPlugin()}" class="${css.pluginSearchButton} btn bg-transparent text-dark border-0 mt-2 text-underline plugins-connect-btn">
+          <button onclick="${_ => this.openLocalPlugin()}" class="${css.pluginSearchButton} btn bg-transparent text-dark border-0 mt-2 text-underline">
             Connect to a Local Plugin
           </button>
         </header>

src/app/tabs/theme-module.js

@@ -3,7 +3,7 @@ import { EventEmitter } from 'events'
 import * as packageJson from '../../../package.json'
 
 const themes = [
-  {name: 'Dark', quality: 'dark', url: 'https://res.cloudinary.com/dvtmp0niu/raw/upload/v1573044638/remix-dark.css'},
+  {name: 'Dark', quality: 'dark', url: 'https://res.cloudinary.com/dvtmp0niu/raw/upload/v1573136151/remix-dark.css'},
   {name: 'Light', quality: 'light', url: 'https://res.cloudinary.com/dvtmp0niu/raw/upload/v1572342742/light-theme.css'},
 
   // switching to the url Todo: remove when the theme is ready