[frontend] Settings navigation design (#1652)

* change header image alignment

(cherry picked from commit df1bb339a5c597a2b668cedb3dafec5a390df120)

* big mess navigation refactor

* bit of cleanup

* minor css tweaks

* fix error rendering code for remote emoji

* refactor navigation structure code

* refactor styling

* fix className

* stash

* restructure navigation generation

* url wildcard formatting

* remove un-implemented User menu entry

* remove commented lines

* clarify permissions check

* invert permissions logic for clarity

web/source/settings/lib/navigation/util.js

@@ -0,0 +1,51 @@
+/*
+	GoToSocial
+	Copyright (C) GoToSocial Authors admin@gotosocial.org
+	SPDX-License-Identifier: AGPL-3.0-or-later
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+"use strict";
+
+const React = require("react");
+const RoleContext = React.createContext([]);
+const BaseUrlContext = React.createContext(null);
+
+function urlSafe(str) {
+	return str.toLowerCase().replace(/[\s/]+/g, "-");
+}
+
+function useHasPermission(permissions) {
+	const roles = React.useContext(RoleContext);
+	return checkPermission(permissions, roles);
+}
+
+function checkPermission(requiredPermissisons, user) {
+	// requiredPermissions can be 'false', in which case there are no restrictions
+	if (requiredPermissisons === false) {
+		return true;
+	}
+
+	// or an array of roles, check if one of the user's roles is sufficient
+	return user.some((role) => requiredPermissisons.includes(role));
+}
+
+function useBaseUrl() {
+	return React.useContext(BaseUrlContext);
+}
+
+module.exports = {
+	urlSafe, RoleContext, useHasPermission, checkPermission, BaseUrlContext, useBaseUrl
+};