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>

.idea/copyright/hedgedoc.xml

@@ -1,6 +0,0 @@
-<component name="CopyrightManager">
-  <copyright>
-    <option name="notice" value="SPDX-FileCopyrightText: ${today.year} The HedgeDoc developers (see AUTHORS file)&#10;&#10;&#83;PDX-License-Identifier: AGPL-3.0-only" />
-    <option name="myName" value="hedgedoc" />
-  </copyright>
-</component>

.idea/copyright/profiles_settings.xml

@@ -1,7 +0,0 @@
-<component name="CopyrightManager">
-  <settings default="hedgedoc">
-    <module2copyright>
-      <element module="All" copyright="hedgedoc" />
-    </module2copyright>
-  </settings>
-</component>

.idea/dictionaries/hedgedoc.xml

@@ -1,16 +0,0 @@
-<!--
-SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
-
-SPDX-License-Identifier: CC-BY-SA-4.0
--->
-
-<component name="ProjectDictionaryState">
-  <dictionary name="hedgedoc">
-    <words>
-      <w>CodiMD</w>
-      <w>HedgeDoc</w>
-      <w>codimd</w>
-      <w>hedgedoc</w>
-    </words>
-  </dictionary>
-</component>

.idea/prettier.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="PrettierConfiguration">
-    <option name="myRunOnReformat" value="true" />
-  </component>
-</project>