feat: clear CHANGELOG.md and local Git tags in setup (#125)

Author: JoshuaKGoldberg

CHANGELOG.md

@@ -1,3 +1,5 @@
+# Changelog
+
 ### [1.20.2](https://github.com/JoshuaKGoldberg/template-typescript-node-package/compare/v1.20.1...v1.20.2) (2022-12-15)
 
 ### Bug Fixes
@@ -35,8 +37,6 @@
 
 - switch from semantic-release to release-it ([#110](https://github.com/JoshuaKGoldberg/template-typescript-node-package/issues/110)) ([c0fcbf4](https://github.com/JoshuaKGoldberg/template-typescript-node-package/commit/c0fcbf46718ee6ad0e3582b1f01e2910a3da847d))
 
-# Changelog
-
 ## [1.7.0](https://github.com/JoshuaKGoldberg/template-typescript-node-package/compare/v1.6.0...v1.7.0) (2022-12-14)
 
 ### Features

script/setup.js

@@ -122,7 +122,7 @@ try {
 		[/"setup": ".*",/, ``, "./package.json"],
 		[
 			`"version": "${existingPackage.version}"`,
-			`"version": "0.0.1"`,
+			`"version": "0.0.0"`,
 			"./package.json",
 		],
 		[/## Explainer.*## Usage/s, `## Usage`, "./README.md"],
@@ -141,6 +141,23 @@ try {
 
 	console.log(chalk.gray`✔️ Done.`);
 
+	console.log();
+	console.log(chalk.gray`Clearing CHANGELOG.md...`);
+
+	await fs.writeFile(
+		"./CHANGELOG.md",
+		prettier.format(`# Changelog`, { parser: "markdown" })
+	);
+
+	console.log(chalk.gray`✔️ Done.`);
+
+	console.log();
+	console.log(chalk.gray`Deleting local git tags...`);
+
+	await $`git tag -d $(git tag -l)`;
+
+	console.log(chalk.gray`✔️ Done.`);
+
 	console.log();
 	console.log(chalk.gray`Hydrating repository labels...`);