fix: remove extra debug code

chore: make example systemd service start after network-online.target

fix: handle destination unreachable messages

docs: add explanation for saving routes to file

feat: add presist and load routes with file

feat: handle unicast solicitation requests statefully

fix: linking with fmt

fix: getting git tag in CMakeLists.txt

feat: add example systemd service file

docs: add instructions for submodules

chore: static link fmt with submodule

feat: initial commit