fix: update links rendering (#594)

Author: JacobCoffee

docs/guides/external-host-requirements.md

@@ -51,7 +51,7 @@ Your server MUST allow **inbound** connections on:
 
 ### System Hardening
 
-Salt will automatically apply comprehensive security hardening (see [Salt harden state](../../salt/base/harden)):
+Salt will automatically apply comprehensive security hardening (see [Salt harden state](https://github.com/python/psf-salt/blob/main/salt/base/harden)):
 
 **SSH Hardening:**
 - Root login disabled after bootstrap
@@ -78,7 +78,7 @@ Salt will automatically apply comprehensive security hardening (see [Salt harden
 ### User Accounts
 
 **User Management:**
-- Created from PSF pillar data (see [Salt users pillar data](../../pillar/base/users))
+- Created from PSF pillar data (see [Salt users pillar data](https://github.com/python/psf-salt/blob/main/pillar/base/users))
 - The pillar data determines, per service, which users are created, their roles (root, etc.), and their SSH keys
 - Sudo access granted to `psf-admin` group (see [Salt sudo pillar data](../../pillar/base/sudoers/init.sls))