remove redundancies in install documentation

admin-guide/deployment/basic_installation.md

@@ -3,7 +3,9 @@
 Linux systems are installed using PXE and Kickstart. The Kickstart
 configuration is auto-generated base on the configuration stored in sysdb/bob.
 
+```{info}
 When PXE boot is not an option, e.g. in restricted networks, it is possible to start iPXE from a USB stick or other media.
+```
 
 The general process for a installation is:
 
@@ -12,11 +14,10 @@ The general process for a installation is:
 3. Reboot the system and trigger a PXE boot (usually by pressing F12 during
    POST)
 
-The default way to interact with sysdb is to use [bob](https://git.psi.ch/linux-infra/bob). `bob` is already set up on `lxsup.psi.ch` for general use.
+The default way to interact with sysdb is to use [bob](https://git.psi.ch/linux-infra/bob). `bob` is already set up on `lxsup.psi.ch` for general use. Remember that you need a valid Kerberos ticket before modifying a sysdb entry via `bob`.
 
-Altenatively you many have on your workstation a local copy of `bob`. This can be done by installing the RPM from the pli-misc repository - https://repos.psi.ch/rhel8/latest/pli-misc/ or by installing the Python package manually.
+Altenatively you many have on your workstation a local copy of `bob`. This can be done by installing the RPM from the pli-misc repository - https://repos.psi.ch/rhel8/latest/pli-misc/ or by installing the Python package manually. More details regaring `bob` can be found [here](https://git.psi.ch/linux-infra/bob).
 
-You might need to set a `PSI_BOB_USER` environment variable (`export PSI_BOB_USER=<you-name-it>`) or use the option `--user` if your local user is different from the one on sysdb.
 
 ## Sysdb Configuration
 
@@ -36,21 +37,20 @@ bob node set-attr $FQDN ipxe_installer=rhel8install
 bob node set-attr $FQDN puppet_role=role::server
 ```
 
-and optional:
+and **optional**:
 ```bash
 # static IP address (options: static, dhcp)
 bob node set-attr $FQDN network=static
+
+# if you want to use hiera groups and sub-groups
 bob node set-attr $FQDN puppet_group=cluster
 bob node set-attr $FQDN puppet_subgroup=compute
+
+# use a differnt puppet environment
 bob node set-attr $FQDN puppet_env=prod
 ```
 
 
-Finally ensure that the node is set to `netboot`:
-```bash
-bob node netboot $FQDN
-```
-
 ### Example
 
 Minimal example: