Change docs to use viewcode instead of linkcode (#1297)

Co-authored-by: kolibril13 <[email protected]>

Author: friedkeenan

docs/source/conf.py

@@ -54,7 +54,7 @@
     "sphinx.ext.autosummary",
     "sphinx.ext.doctest",
     "sphinx.ext.extlinks",
-    "sphinx.ext.linkcode",
+    "sphinx.ext.viewcode",
     "sphinxext.opengraph",
     "manim_directive",
 ]
@@ -128,19 +128,6 @@
 html_css_files = ["custom.css"]
 
 
-# source links to github
-def linkcode_resolve(domain, info):
-    if domain != "py":
-        return None
-    if not info["module"]:
-        return None
-    filename = info["module"].replace(".", "/")
-    version = os.getenv("READTHEDOCS_VERSION", "master")
-    if version == "latest" or version == "stable":
-        version = "master"
-    return f"https://github.com/ManimCommunity/manim/blob/{version}/{filename}.py"
-
-
 # external links
 extlinks = {
     "issue": ("https://github.com/ManimCommunity/manim/issues/%s", "issue "),