remove broken Gogs/notabug.com support

Gogs isn't Gitea.
The API surface of Gogs is different from Gitea's.

Additionally, notabug.com uses a multiple years old version of Gogs,
which has neither `/tags` nor `/commits` implemented.

The implementation we use in `version/gitea.py` simple does not work.

You can check this yourself by running `nix-update libgtkflow4`, one of
the few packages in nixpkgs that are hosted on notabug.com

README.md

@@ -11,7 +11,6 @@ designed to work with nixpkgs but also other package sets.
   - Gitea
   - GitHub
   - GitLab
-  - NotABug.org
   - PyPi
   - RubyGems.org
   - Sourcehut

nix_update/update.py

@@ -323,7 +323,7 @@ def update_version(
         elif package.parsed_url.netloc == "github.com":
             _, owner, repo, *_ = package.parsed_url.path.split("/")
             package.diff_url = f"https://github.com/{owner}/{repo.removesuffix('.git')}/compare/{package.rev}...{new_version.rev or new_version.number}"
-        elif package.parsed_url.netloc in ["codeberg.org", "gitea.com", "notabug.org"]:
+        elif package.parsed_url.netloc in ["codeberg.org", "gitea.com"]:
             _, owner, repo, *_ = package.parsed_url.path.split("/")
             package.diff_url = f"https://{package.parsed_url.netloc}/{owner}/{repo}/compare/{package.rev}...{new_version.rev or new_version.number}"
         elif GITLAB_API.match(package.parsed_url.geturl()) and package.src_homepage:

nix_update/version/__init__.py

@@ -133,5 +133,5 @@ def fetch_latest_version(
         )
 
     raise VersionError(
-        "Please specify the version. We can only get the latest version from codeberg/crates.io/gitea/github/gitlab/notabug/pypi/savannah/sourcehut/rubygems projects right now"
+        "Please specify the version. We can only get the latest version from codeberg/crates.io/gitea/github/gitlab/pypi/savannah/sourcehut/rubygems projects right now"
     )

nix_update/version/gitea.py

@@ -6,7 +6,7 @@ from .version import Version
 
 
 def fetch_gitea_versions(url: ParseResult) -> list[Version]:
-    if url.netloc not in ["codeberg.org", "gitea.com", "notabug.org"]:
+    if url.netloc not in ["codeberg.org", "gitea.com"]:
         return []
 
     _, owner, repo, *_ = url.path.split("/")
@@ -17,7 +17,7 @@ def fetch_gitea_versions(url: ParseResult) -> list[Version]:
 
 
 def fetch_gitea_snapshots(url: ParseResult, branch: str) -> list[Version]:
-    if url.netloc not in ["codeberg.org", "gitea.com", "notabug.org"]:
+    if url.netloc not in ["codeberg.org", "gitea.com"]:
         return []
 
     _, owner, repo, *_ = url.path.split("/")