<commit_before>## Firebase authentication with Nebular Auth

`@nebualar/firebase-auth` allows authentication in firebase applications with `@nebular/auth`.
The package provides the following strategies:
  - `NbFirebasePasswordStrategy` - authentication with email/password
  - `NbFirebaseGoogleStrategy` - authentication with google accounts
  - `NbFirebaseFacebookStrategy` - authentication with facebook accounts
  - `NbFirebaseTwitteStrategy` - authentication with twitter accounts

`@nebular/auth` package is sponsored by [GO-ER](www.go-er.com) and What Now Travel.

## Installation

<div class="note note-info">
  <div class="note-title">Note</div>
  <div class="note-body"><commit_msg>docs(firebase-auth): use correct sponsors links (#2408)<commit_after>## Firebase authentication with Nebular Auth

`@nebualar/firebase-auth` allows authentication in firebase applications with `@nebular/auth`.
The package provides the following strategies:
  - `NbFirebasePasswordStrategy` - authentication with email/password
  - `NbFirebaseGoogleStrategy` - authentication with google accounts
  - `NbFirebaseFacebookStrategy` - authentication with facebook accounts
  - `NbFirebaseTwitteStrategy` - authentication with twitter accounts

`@nebular/auth` package is sponsored by [GO-ER](https://go-er.com) and [What Now Travel](https://whatnow.travel/).

## Installation

<div class="note note-info">
  <div class="note-title">Note</div>
  <div class="note-body">
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