chore: Add clog sections

When the .clog.toml exists, it overrides the default clog sections even
if there is no [sections].

[1] https://github.com/clog-tool/clog-lib/blob/0289b1bb76386baa40ed3a0d75e99d3cc6b3fb77/src/clog.rs#L146

.clog.toml

@@ -1,2 +1,8 @@
 [clog]
 repository = "https://github.com/Frederick888/gh-ph"
+[sections]
+Features = ["feat"]
+"Bug Fixes" = ["fix"]
+Performance = ["perf"]
+Reverts = ["revert"]
+"Breaking Changes" = ["breaks"]