chore: update privacy page

src/pages/privacy.mdx

@@ -45,6 +45,53 @@ Particularly, we use Google Analytics to collect and process certain analytics
 data. To learn more about Google Analytics and how to opt out, please visit
 https://www.google.com/policies/privacy/partners/.
 
+### Symposia App Login and Authentication with Google and GitHub Providers
+
+We offer the option to sign in to our app using Google or GitHub OAuth for a
+convenient and secure login experience.
+
+#### Google OAuth
+
+When you sign in with Google, we collect the following information:
+
+-   **Email Address:** Used to create your account, communicate with you, and
+    send you relevant notifications.
+-   **Profile Information (e.g., name, profile picture):** Used to personalize
+    your experience within the app.
+
+We take strict security measures to protect your data and comply with applicable
+data privacy laws. Your data is stored securely and is only used for purposes
+related to your experience with Symposia. We do not share your Google account
+data with third parties except as required by law.
+
+#### GitHub OAuth
+
+When you sign in with GitHub, we collect the following information:
+
+-   **GitHub Username:** Used to create your account and link your GitHub
+    profile.
+-   **Public Profile Information (e.g., name, profile picture):** Used for
+    personalization and to integrate with GitHub-related features within the
+    app.
+-   **Email Address (if public on GitHub):** Used to create your account and
+    communicate with you.
+
+We do not store or access your GitHub credentials. Your GitHub data is handled
+in accordance with [GitHub's privacy policy](https://github.com/privacy). If you
+use features that integrate with GitHub, such as importing projects or
+collaborating with other users, we only access the necessary data to provide
+these features and do not retain unnecessary information.
+
+#### OAuth Data Consent and Security
+
+By using these OAuth options, you consent to the collection and use of your data
+as described above. We employ industry-standard security measures to protect
+your information and ensure compliance with relevant data privacy regulations.
+
+For more details, please refer to the
+[Google Privacy Policy](https://policies.google.com/privacy) and the
+[GitHub Privacy Policy](https://github.com/privacy).
+
 ## Information We Collect Directly From You
 
 You can generally visit our website without having to submit any personal