Make Github stars dynamic and improve database init (#5000)

I extracted the init database logic into its own file. 
You can now run it with yarn database:init.
Added database entry for GitHub stars. 

Do you want me to remove the init route or is it used for something else
?

---------

Co-authored-by: Ady Beraud <a.beraud96@gmail.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-website/src/github-sync/github-sync.ts

@@ -0,0 +1,8 @@
+import { fetchAndSaveGithubData } from '@/github-sync/fetch-and-save-github-data';
+
+export const githubSync = async () => {
+  await fetchAndSaveGithubData();
+  process.exit(0);
+};
+
+githubSync();