install: fix new links back to main Bonfire
install: fix new links back to main Bonfire

i.e. for subdirectory installs.

I used base_url() instead of site_url() to avoid adding the /index.php/
segment that the installer uses.

PeterRock/Ci-Bonfire3,kelaskakap/cms-api-unggun,kelaskakap/cms-api-unggun,PeterRock/Ci-Bonfire3,PeterRock/Ci-Bonfire3,kelaskakap/cms-api-unggun