[frontend] Unified panels (#812)

* settings panel restructuring

* clean up old Gin handlers

* colorscheme redesign, some other small css tweaks

* basic router layout, error boundary

* colorscheme redesign, some other small css tweaks

* kebab-case consistency

* superfluous padding on applist

* remove unused consts

* redux, whitespace changes..

* use .jsx extensions for components

* login flow up till app registration

* full redux oauth implementation, with basic error handling

* split oauth api functions

* oauth api revocation handling

* basic profile change submission

* move old dir

* profile overview

* fix keeping track of the wrong instance url (for different instance/api domains)

* use redux state for profile form

* delete old/index.js, old/basic.js, fully implemented

* implement old/user/profile.js

* implement password change

* remove debug logging

* support future api for removing files

* customize profile css

* remove unneeded wrapper components

* restructure form fields

* start on admin pages

* admin panel settings

* admin settings panel

* remove old/admin files

* add top-level redirect

* refactor/cleanup forms

* only do API checks on logged-in state

* admin-status based routing

* federation block routing

* federation blocks

* upgrade dependencies

* react 18 changes

* media cleanup

* fix useEffect hooks

* remove unused require

* custom emoji base

* emoji uploader

* delete last old panel files

* sidebar styling, remove unused page

* refactor submit functions

* fix sidebar boxshadow-border

* fix old css variables

* fix fake-toot avatar

* fix non-square emoji

* fix user settings redux keys

* properly get admin account contact from instance response

* Account.source default values

* source.status_format key

* mobile responsiveness

* mobile element tweaks

* proper redirect after removing block

* add redirects for old setting panel urls

* deletes

* fix mobile overflow

* clean up debug logging calls

internal/web/settings-panel.go

@@ -0,0 +1,53 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   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/>.
+*/
+
+package web
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (m *Module) SettingsPanelHandler(c *gin.Context) {
+	host := config.GetHost()
+	instance, err := m.processor.InstanceGet(c.Request.Context(), host)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorInternalError(err), m.processor.InstanceGet)
+		return
+	}
+
+	c.HTML(http.StatusOK, "frontend.tmpl", gin.H{
+		"instance": instance,
+		"stylesheets": []string{
+			assetsPathPrefix + "/Fork-Awesome/css/fork-awesome.min.css",
+			assetsPathPrefix + "/dist/_colors.css",
+			assetsPathPrefix + "/dist/base.css",
+			assetsPathPrefix + "/dist/profile.css",
+			assetsPathPrefix + "/dist/status.css",
+			assetsPathPrefix + "/dist/settings-panel-style.css",
+		},
+		"javascript": []string{
+			assetsPathPrefix + "/dist/bundle.js",
+			assetsPathPrefix + "/dist/settings.js",
+		},
+	})
+}