Fix the linkcode function to resolve paths relative to the morpheus root (#2323)

* This code was broken when we refactored code into `morpheus_dfp` and `morpheus_llm` packages and put them under the `python` subdir.

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - David Gardner (https://github.com/dagardner-nv)

Approvers:
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

URL: #2323

Author: dagardner-nv

docs/source/conf.py

@@ -351,9 +351,9 @@
 
 # The following is used by sphinx.ext.linkcode to provide links to github
 linkcode_resolve = make_linkcode_resolve(
-    'morpheus', 'https://github.com/nv-morpheus/Morpheus'
-    '/blob/{revision}/'
-    '{package}/{path}#L{lineno}')
+    morpheus_root=morpheus_root,
+    package='morpheus',
+    url_fmt='https://github.com/nv-morpheus/Morpheus/blob/{revision}/{path}#L{lineno}')
 
 # Set the default role for interpreted code (anything surrounded in `single
 # backticks`) to be a python object. See

docs/source/sphinxext/github_link.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2021-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2021-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -59,7 +59,7 @@ def _get_git_revision():
     return revision.decode('utf-8')
 
 
-def _linkcode_resolve(domain, info, package, url_fmt, revision):
+def _linkcode_resolve(domain, info, *, package, url_fmt, revision, morpheus_root):
     """Determine a link to online source for a class/method/function
 
     This is called by sphinx.ext.linkcode
@@ -139,7 +139,7 @@ def _linkcode_resolve(domain, info, package, url_fmt, revision):
             fn = os.path.abspath(os.path.join("..", "python", fn))
 
         # Convert to relative from module root
-        fn = os.path.relpath(fn, start=os.path.dirname(__import__(package).__file__))
+        fn = os.path.relpath(fn, start=morpheus_root)
 
     # Get the line number if we need it. (Can work without it)
     if (lineno is None):
@@ -152,10 +152,13 @@ def _linkcode_resolve(domain, info, package, url_fmt, revision):
                 lineno = obj.__code__.co_firstlineno
             else:
                 lineno = ''
-    return url_fmt.format(revision=revision, package=package, path=fn, lineno=lineno)
 
+    url = url_fmt.format(revision=revision, package=package, path=fn, lineno=lineno)
 
-def make_linkcode_resolve(package, url_fmt):
+    return url
+
+
+def make_linkcode_resolve(*, morpheus_root: str, package: str, url_fmt: str):
     """Returns a linkcode_resolve function for the given URL format
 
     revision is a git commit reference (hash or name)
@@ -167,4 +170,4 @@ def make_linkcode_resolve(package, url_fmt):
                                    '{path}#L{lineno}')
     """
     revision = _get_git_revision()
-    return partial(_linkcode_resolve, revision=revision, package=package, url_fmt=url_fmt)
+    return partial(_linkcode_resolve, morpheus_root=morpheus_root, revision=revision, package=package, url_fmt=url_fmt)