Revert "make colab button more visible in docs"

This reverts commit bdfc00b.

docs/conf.py

@@ -101,10 +101,10 @@
     "pygment_dark_style": "github-dark-high-contrast",
     "path_to_docs": "docs",
     "repository_branch": "main",
-    # "launch_buttons": {
-    #     "notebook_interface": "jupyterlab",
-    #     "colab_url": "https://colab.research.google.com/",
-    # },
+    "launch_buttons": {
+        "notebook_interface": "jupyterlab",
+        "colab_url": "https://colab.research.google.com/",
+    },
 }
 
 html_css_files = ["custom.css"]
@@ -148,13 +148,3 @@
 # Tell sphinx-autodoc-typehints to generate stub parameter annotations including
 # types, even if the parameters aren't explicitly documented.
 always_document_param_types = True
-
-nbsphinx_prolog = r"""
-{% set docname = 'docs/' + env.doc2path(env.docname, base=None) %}
-.. only:: html
-    .. role:: raw-html(raw)
-        :format: html
-    .. nbinfo::
-        Open in colab:
-        :raw-html:`<a href="https://colab.research.google.com/github/asem000/serket/blob/main/{{ docname }}"><img alt="Open in colab" src="https://colab.research.google.com/assets/colab-badge.svg" style="vertical-align:text-bottom"></a>`
-"""