docs: replace all git.io links with their actual urls (#3146)

* docs: replace all `git.io` link within the README

* docs: replace `git.io` in `empty-rules` message

@commitlint/cli/src/cli.ts

@@ -248,8 +248,8 @@ async function main(args: MainArgs) {
 					name: 'empty-rules',
 					message: [
 						'Please add rules to your `commitlint.config.js`',
-						'    - Getting started guide: https://git.io/fhHij',
-						'    - Example config: https://git.io/fhHip',
+						'    - Getting started guide: https://commitlint.js.org/#/?id=getting-started',
+						'    - Example config: https://github.com/conventional-changelog/commitlint/blob/master/%40commitlint/config-conventional/index.js',
 					].join('\n'),
 				},
 			],

README.md

@@ -222,9 +222,9 @@ If you are stuck on an older version and need a security patch we're happy if yo
 
 ## Related projects
 
-- [conventional-changelog](https://git.io/v18sw) – Generate a changelog from conventional commit history
-- [commitizen](https://git.io/vwTym) – Simple commit conventions for internet citizens
-- [create-semantic-module](https://git.io/vFjFg) – CLI for quickly integrating commitizen and commitlint in new or existing projects
+- [conventional-changelog](https://github.com/conventional-changelog/conventional-changelog) – Generate a changelog from conventional commit history
+- [commitizen](https://github.com/commitizen/cz-cli) – Simple commit conventions for internet citizens
+- [create-semantic-module](https://github.com/jlegrone/create-semantic-module) – CLI for quickly integrating commitizen and commitlint in new or existing projects
 
 ## License