Add changelog, delete now-unused workflows include.

Author: mattstein

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [2.0.0] - 2024-09-17
+
+### Added
+
+- Added GitHub Actions release flow.
+
+### Changed
+
+- Updated namespace.
+- Renamed `master` branch to `main`.
+- Swapped in `joetannenbaum/alfred-workflow` via Composer, with PHP 8.
+- Updated icon.
+
+## [1.0.0] - 2022-07-19
+
+### Added
+
+- Sort-of first version. (Never officially tagged or released.)