Set scrollbar colors as global styles (#1484)

* Setting global webkit-scrollbar styles

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Removing usage of custom-scrollbar mixin

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Set overflow:auto on .Table

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Fixing .drawer-content paddings

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Cleaning up

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/renderer/components/+preferences/preferences.scss

@@ -6,7 +6,6 @@
 
     .Badge {
       display: flex;
-      margin: 0;
       margin-bottom: 1px;
       padding: $padding $spacing;
     }

src/renderer/components/+preferences/preferences.tsx

@@ -137,7 +137,7 @@ export class Preferences extends React.Component {
           formatOptionLabel={this.formatHelmOptionLabel}
           controlShouldRenderValue={false}
         />
-        <div className="repos flex gaps column">
+        <div className="repos flex column">
           {Array.from(this.helmAddedRepos).map(([name, repo]) => {
             const tooltipId = `message-${name}`;
             return (