Move "core" folder out of "features" into "base"

src/base/components/texts/Kbd.tsx

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { styled } from '@mui/material/styles';
+import Typography from '@mui/material/Typography';
+
+export const Kbd = styled(Typography)(({ theme }) => ({
+    display: 'inline-block',
+    padding: '0.2em 0.4em',
+    fontSize: '0.85em',
+    lineHeight: '1.4',
+    color: theme.palette.text.primary,
+    backgroundColor: theme.palette.background.paper,
+    border: `1px solid ${theme.palette.divider}`,
+    borderRadius: '3px',
+    boxShadow: `inset 0 -1px 0 ${theme.palette.divider}`,
+    fontFamily: 'monospace, monospace',
+}));