Update links to docs (#273)

Use our main docs site as a base.

Author: therve

mkdocs.yml

@@ -1,7 +1,7 @@
 site_name: Datadog API Client for Python
 site_description: The home of Datadog API Python Client documentation
 site_author: Datadog
-site_url: https://datadoghq.dev/datadog-api-client-python/
+site_url: https://docs.datadoghq.com/api/
 repo_name: datadog/datadog-api-client-python
 repo_url: https://github.com/DataDog/datadog-api-client-python
 edit_uri: blob/master/docs
@@ -59,4 +59,4 @@ extra:
     - icon: fontawesome/brands/twitter
       link: https://twitter.com/datadoghq
     - icon: fontawesome/brands/instagram
-      link: https://www.instagram.com/datadoghq
+      link: https://www.instagram.com/datadoghq

setup.cfg

@@ -28,7 +28,7 @@ classifiers=
     Programming Language :: Python :: 3.8
 project_urls =
     Bug Tracker = https://github.com/DataDog/datadog-api-client-python/issues
-    Documentation = https://datadoghq.dev/datadog-api-client-python/
+    Documentation = https://docs.datadoghq.com/api/
     Source Code = https://github.com/DataDog/datadog-api-client-python
 
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