docs: ✨ swizzle doc page to implement github auth access

Signed-off-by: slumbering <slumbering.pierrot@gmail.com>

website/src/components/DocAuthentication.js

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+import React from "react";
+import { GithubLoginButton } from 'react-social-login-buttons';
+import style from './DocAuthentication.module.css'
+
+export default function DocAuthentication() {
+    return (
+        <div className={style.container}>
+            <h1 className={style.h1}>Welcome on Dagger documentation</h1>
+            <p>Please Sign in to Github in order to get access to the doc</p>
+            <GithubLoginButton className={style.btn__github} onClick={() => window.location.href = `//github.com/login/oauth/authorize?client_id=${process.env.REACT_APP_CLIENT_ID}&scope=user&allow_signup=false`} />
+        </div>
+    )
+}

website/src/components/DocAuthentication.module.css

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+.container {
+  background: url("/img/Dagger_Website_Space_Uranus.png") no-repeat;
+  background-size: cover;
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.btn__github {
+  width: 240px !important;
+}

website/src/components/Spinner.js

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+import React from 'react';
+import styles from './Spinner.module.css';
+
+export default function Spinner() {
+    return (
+        <div className={styles.ellipsis}><div></div><div></div><div></div><div></div></div>
+    )
+}

website/src/components/Spinner.module.css

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+.ellipsis {
+  display: inline-block;
+  position: absolute;
+  top: 50vh;
+  z-index: 99999;
+  left: 50vw;
+  transform: translate(-50%, -50%);
+  width: 80px;
+  height: 80px;
+}
+.ellipsis div {
+  position: absolute;
+  top: 33px;
+  width: 13px;
+  height: 13px;
+  border-radius: 50%;
+  background: var(--ifm-color-primary-dark);
+  animation-timing-function: cubic-bezier(0, 1, 1, 0);
+}
+
+html[data-theme="dark"] .ellipsis div {
+  background: var(--ifm-color-primary-light);
+}
+
+.ellipsis div:nth-child(1) {
+  left: 8px;
+  animation: lds-ellipsis1 0.6s infinite;
+}
+.ellipsis div:nth-child(2) {
+  left: 8px;
+  animation: lds-ellipsis2 0.6s infinite;
+}
+.ellipsis div:nth-child(3) {
+  left: 32px;
+  animation: lds-ellipsis2 0.6s infinite;
+}
+.ellipsis div:nth-child(4) {
+  left: 56px;
+  animation: lds-ellipsis3 0.6s infinite;
+}
+@keyframes lds-ellipsis1 {
+  0% {
+    transform: scale(0);
+  }
+  100% {
+    transform: scale(1);
+  }
+}
+@keyframes lds-ellipsis3 {
+  0% {
+    transform: scale(1);
+  }
+  100% {
+    transform: scale(0);
+  }
+}
+@keyframes lds-ellipsis2 {
+  0% {
+    transform: translate(0, 0);
+  }
+  100% {
+    transform: translate(24px, 0);
+  }
+}