Added missing copyright, terms of use, privacy

Summary:
Fixing Automated checkup

https://www.internalfb.com/intern/opensource/github/repo/978273877280726/checkup/

Reviewed By: una-dinosauria

Differential Revision: D63753101

fbshipit-source-id: 550464583a0a81c79a87c351de0e0aae2041db5f

docs/source/_static/custom.css

@@ -69,3 +69,10 @@ ul.bd-breadcrumbs {
 p.bd-links__title {
   visibility: collapse;
 }
+
+.external_link::after {
+  font: var(--fa-font-solid);
+  content: var(--pst-icon-external-link);
+  font-size: 0.75em;
+  margin-left: 0.3em;
+}

docs/source/_templates/legal.html

+<div class="footer-item">
+    <p class="copyright">
+        Legal
+        <br>
+    </p>
+</div>
+<div class="footer-item">
+    <p class="copyright">
+        <a class="external_link"
+           href="https://opensource.facebook.com/legal/privacy/"
+           target="_blank"
+           rel="noreferrer noopener">
+            Privacy
+        </a>
+        <br>
+    </p>
+</div>
+<div class="footer-item">
+    <p class="copyright">
+        <a class="external_link"
+           href="https://opensource.facebook.com/legal/terms/"
+           target="_blank"
+           rel="noreferrer noopener">
+            Terms
+        </a>
+        <br>
+    </p>
+</div>

docs/source/conf.py

-#!/usr/bin/env python3
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 
 # -- Path setup --------------------------------------------------------------
 
@@ -17,7 +20,7 @@ from drtk import __version__
 # -- Project information -----------------------------------------------------
 
 project = "DRTK"
-copyright = "2024, Meta"
+copyright = "2024 Meta Platforms, Inc"
 author = "Meta"
 version = __version__
 
@@ -55,6 +58,7 @@ html_theme_options = {
     "navbar_align": "content",
     "navbar_start": ["navbar-logo"],
     "navbar_end": ["theme-switcher", "navbar-icon-links"],
+    "footer_center": ["legal"],
     "collapse_navigation": True,
     "secondary_sidebar_items": ["page-toc"],
     "show_prev_next": False,
@@ -80,4 +84,5 @@ html_theme_options = {
 }
 
 html_static_path = ["_static"]
+templates_path = ["_templates"]
 html_css_files = ["custom.css"]