chore: rm CHANGELOG.md (#4240)

# What does this PR do?

We don't do a good job at maintaining this file, also the GH action does
not seem to be running.
Let's stick with GH release notes instead.

Signed-off-by: Sébastien Han <seb@redhat.com>

scripts/gen-changelog.py

@@ -1,74 +0,0 @@
-#!/usr/bin/env python
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-# All rights reserved.
-#
-# This source code is licensed under the terms described in the LICENSE file in
-# the root directory of this source tree.
-
-import os
-
-import requests
-
-
-def get_all_releases(token):
-    url = "https://api.github.com/repos/meta-llama/llama-stack/releases"
-    headers = {"Accept": "application/vnd.github.v3+json"}
-
-    if token:
-        headers["Authorization"] = f"token {token}"
-
-    response = requests.get(url, headers=headers)
-
-    if response.status_code == 200:
-        return response.json()
-    else:
-        raise Exception(f"Error fetching releases: {response.status_code}, {response.text}")
-
-
-def clean_release_body(body):
-    """Remove '## All changes' sections from release notes."""
-    lines = body.split("\n")
-    cleaned_lines = []
-    skip_mode = False
-
-    for line in lines:
-        if line.strip() in [
-            "## All changes",
-            "### What's Changed",
-            "## What's Changed",
-            "## New Contributors",
-        ]:
-            skip_mode = True
-        elif skip_mode and line.startswith("##"):
-            # Found a new section, stop skipping
-            skip_mode = False
-            cleaned_lines.append(line)
-        elif not skip_mode:
-            cleaned_lines.append(line)
-
-    return "\n".join(cleaned_lines)
-
-
-def merge_release_notes(output_file, token=None):
-    releases = get_all_releases(token)
-
-    with open(output_file, "w", encoding="utf-8") as md_file:
-        md_file.write("# Changelog\n\n")
-
-        for release in releases:
-            md_file.write(f"# {release['tag_name']}\n")
-            md_file.write(f"Published on: {release['published_at']}\n\n")
-
-            # Clean the release body to remove "## All changes" sections
-            cleaned_body = clean_release_body(release["body"])
-            md_file.write(f"{cleaned_body}\n\n")
-
-            md_file.write("---\n\n")
-
-    print(f"Merged release notes saved to {output_file}")
-
-
-if __name__ == "__main__":
-    OUTPUT_FILE = "CHANGELOG.md"
-    TOKEN = os.getenv("GITHUB_TOKEN")
-    merge_release_notes(OUTPUT_FILE, TOKEN)