docs: use relative path in root README

so it will link to correct location in branches and tags as well
root README isn't published to npm, so no worries about broken links getting rendered in npmjs

Author: AviVahl

README.md

@@ -4,15 +4,15 @@ Several packages to assist [TypeScript](https://www.typescriptlang.org/) develop
 
 ## Packages
 
-- **[@ts-tools/node](https://github.com/AviVahl/ts-tools/tree/main/packages/node)** - TypeScript support for Node.js. Registers a `require.extensions` (CommonJS) hook, allowing execution of `.ts`/`.tsx` files directly from source.
+- **[@ts-tools/node](./packages/node)** - TypeScript support for Node.js. Registers a `require.extensions` (CommonJS) hook, allowing execution of `.ts`/`.tsx` files directly from source.
 
-- **[@ts-tools/webpack-loader](https://github.com/AviVahl/ts-tools/tree/main/packages/webpack-loader)** - TypeScript loader for webpack.
+- **[@ts-tools/webpack-loader](./packages/webpack-loader)** - TypeScript loader for webpack.
 
-- **[@ts-tools/transpile](https://github.com/AviVahl/ts-tools/tree/main/packages/transpile)** - TypeScript transpilation helpers.
+- **[@ts-tools/transpile](./packages/transpile)** - TypeScript transpilation helpers.
 
-- **[@ts-tools/robotrix](https://github.com/AviVahl/ts-tools/tree/main/packages/robotrix)** - Useful TypeScript transpilation transformers.
+- **[@ts-tools/robotrix](./packages/robotrix)** - Useful TypeScript transpilation transformers.
 
-- **[@ts-tools/esm](https://github.com/AviVahl/ts-tools/tree/main/packages/esm)** - TypeScript support for Node.js. Exposes a loader (ESM), allowing execution of `.ts`/`.tsx` files directly from source.
+- **[@ts-tools/esm](./packages/esm)** - TypeScript support for Node.js. Exposes a loader (ESM), allowing execution of `.ts`/`.tsx` files directly from source.
 
 ## License