[Glitch] Change icon button styles to make hover/focus states more obvious

Port c8fd823327 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/text_icon_button.js

@@ -1,29 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-
-export default class TextIconButton extends React.PureComponent {
-
-  static propTypes = {
-    label: PropTypes.string.isRequired,
-    title: PropTypes.string,
-    active: PropTypes.bool,
-    onClick: PropTypes.func.isRequired,
-    ariaControls: PropTypes.string,
-  };
-
-  handleClick = (e) => {
-    e.preventDefault();
-    this.props.onClick();
-  }
-
-  render () {
-    const { label, title, active, ariaControls } = this.props;
-
-    return (
-      <button title={title} aria-label={title} className={`text-icon-button ${active ? 'active' : ''}`} aria-expanded={active} onClick={this.handleClick} aria-controls={ariaControls}>
-        {label}
-      </button>
-    );
-  }
-
-}