* OAuth2 authentication implementation

This PR shoul fix #2392. Used `passport-oauth2` strategy.

* indentations cleanup

* cleanup code

This commit replaces the observably defunct @aoberoi/passport-slack
implementation with that of nmaves's passport-slack-oauth2

* Add support of hd google auth parameter - to work with G Suite domains

* Style-fix

* fix: google auth hostedDomain hint
Co-authored-by: Nicolas Giard <github@ngpixel.com>

Co-authored-by: Kevyn Bruyere <kevyn@inovasi.fr>

This adds cookieEncryptionKeyString configuration in the Azure AD
authentication module.  It represents an array of cookie encryption
strings and enables workaround for SameSite cookies.

Change "discordapp.com" to "discord.com"

* fix: pass userinfo URL in oidc strategy

The userinfo URL from the definition was not being provided to the
passport strategy, which resulted in a type error trying to resolve the
user's profile. Furthermore, the name of the defined URL was
inconsistent with all other authentication method URLs.

* fix: pass all necessary scopes to oidc auth method

When no scopes are provided, passport-openidconnect uses only `openid`,
which does not contain the username or email address. Include `profile`
and `email` to ensure the necessary claims are included.

* fix: update oidc method to call processProfile correctly

Now the profile object and providerKey are passed to processProfile. The
usernameClaim no longer has any use as the email address is the
username.

* fix: mark oidc authentication method as available

* feat: multiple auth instances

* fix: auth setup + strategy initialization

* feat: admin auth - add strategy

* feat: redirect on login - group setting

* feat: oauth2 generic - props definitions

* feat: new login UI (wip)

* feat: new login UI (wip)

* feat: admin security login settings

* feat: tabset editor indicators + print view improvements

* fix: code styling

Signed-off-by: Jonas Jöst <jonas@gpplanet.de>

* Optionally restrict discord authentication to members of a specific server

* fix: discord auth module code linting
Co-authored-by: Lucas Neves <lneves@modusgames.com>
Co-authored-by: Nicolas Giard <github@ngpixel.com>

* added custom keycloak authentication.

* update readme.

* updated readme.

* reverted README for PR.

* fix: use async/await

* changed callback parameter name from done to cb.

* fix: keycloak description + website

* fix: keycloak logo

* updating a switch into object literal and fixed a couple linter errors

* added a comment about weird formatting

* style: use lodash get

* fix: pass eslint + puglint + jest