Ensure sync service starts after reboot

To allow taskwarrior to sync with taskserver after a reboot one has to run (once):
```bash
export TASKDDATA=/var/taskd
taskdctl start
```
Then one can sync with:
```bash
task sync
```

## TODO
- [ ] To automate this, ensure the taskserver is started upon boot/login. One option to do so is to ensure the following content:
```bash
export TASKDDATA=/var/taskd
taskdctl start
```
is in the file:
```bash
~/.bashrc
```