🔄🔐 refactor: auth; style: match OpenAI; feat: custom social login order (#1421)

* refactor(Login & Registration)

* fix(Registration) test errors

* refactor(LoginForm & ResetPassword)

* fix(LoginForm): display 'undefined' when loading page; style(SocialButton): match OpenAI's graphics

* some refactor and style update for social logins

* style: width like OpenAI; feat: custom social login order; refactor: alphabetical socials

* fix(Registration & Login) test

* Update .env.example

* Update .env.example

* Update dotenv.md

* refactor: remove `SOCIAL_LOGIN_ORDER` for `socialLogins` configured from `librechat.yaml`
- initialized by AppService, attached as app.locals property
- rename socialLoginOrder and loginOrder to socialLogins app-wide for consistency
- update types and docs
- initialize config variable as array and not singular string to parse
- bump data-provider to 0.3.9

---------

Co-authored-by: Danny Avila <messagedaniel@protonmail.com>

api/server/routes/__tests__/config.spec.js

@@ -56,13 +56,14 @@ describe.skip('GET /', () => {
     expect(response.statusCode).toBe(200);
     expect(response.body).toEqual({
       appTitle: 'Test Title',
-      googleLoginEnabled: true,
+      socialLogins: ['google', 'facebook', 'openid', 'github', 'discord'],
+      discordLoginEnabled: true,
       facebookLoginEnabled: true,
+      githubLoginEnabled: true,
+      googleLoginEnabled: true,
       openidLoginEnabled: true,
       openidLabel: 'Test OpenID',
       openidImageUrl: 'http://test-server.com',
-      githubLoginEnabled: true,
-      discordLoginEnabled: true,
       serverDomain: 'http://test-server.com',
       emailLoginEnabled: 'true',
       registrationEnabled: 'true',