fix: Move content into to frontend directory

Doing this BEFORE the merge prevents a lot of merge conflicts.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/src/components/common/fork-awesome/fork-awesome-icon.tsx

@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import React from 'react'
+import type { IconName, IconSize } from './types'
+
+export interface ForkAwesomeIconProps {
+  icon: IconName
+  className?: string
+  fixedWidth?: boolean
+  size?: IconSize
+  stacked?: boolean
+}
+
+/**
+ * Renders a fork awesome icon.
+ *
+ * @param icon The icon that should be rendered.
+ * @param fixedWidth If the icon should be rendered with a fixed width.
+ * @param size The size class the icon should be rendered in.
+ * @param className Additional classes the icon should get.
+ * @param stacked If the icon is part of a {@link ForkAwesomeStack stack}.
+ * @see https://forkaweso.me
+ */
+export const ForkAwesomeIcon: React.FC<ForkAwesomeIconProps> = ({
+  icon,
+  fixedWidth = false,
+  size,
+  className,
+  stacked = false
+}) => {
+  const fixedWithClass = fixedWidth ? 'fa-fw' : ''
+  const sizeClass = size ? `-${size}` : stacked ? '-1x' : ''
+  const stackClass = stacked ? '-stack' : ''
+  const extraClasses = `${className ?? ''} ${sizeClass || stackClass ? `fa${stackClass}${sizeClass}` : ''}`
+  return <i className={`fa ${fixedWithClass} fa-${icon} ${extraClasses}`} />
+}