Update index.md

Typo fix.
Replace any usage of 'ifconfig' with the appropriate commands from 'iproute2' as net-tools (providing ifconfig) is mostly deprecated, unmaintained and partially broken.
Flush the IPs of the NIC before adding a static one.
Merge pull request #83 from eliasp/ifconfig-to-iproute2

Update docs wrt the usage of ifconfig
Merge pull request #76 from jeffallen/patch-1

Update index.md
Corrected the SSH login for the libvirt VM and adapted the example IP to the one used in the 'run.sh' example above.
Disable + stop the DHCP service first before applying the static network setup.
minor spelling fix
Merge pull request #86 from aschepis/patch-1

Minor spelling fix
Merge pull request #85 from eliasp/static-network-setup

Disable + stop the DHCP service first before applying the static network setup
Merge pull request #84 from eliasp/libvirt-ssh

Corrected the SSH login for the libvirt VM and adapted the example IP to...
fix(systemd): correct unit examples