Don't hide taskbook directories

**Is your feature request related to a problem? Please describe.**

Taskbook stores its metadata under `~/.taskbook/`, e.g.

* `~/.taskbook/.archive`
* `~/.taskbook/.storage`

If configure my taskbook config to point to say, `/Users/me/google drive/taskbook`, it will create the `.archive` and `.storage` folders in there.

As they are hidden, the google drive client won't sync them

**Describe the solution you'd like**

Under the taskbook directory, all data within should not be hidden

e.g.

```
/Users/me/google_drive/taskbook/archive
/Users/me/google_drive/taskbook/storage
```

Locate the code that creates the configured taskbook directory's `.archive` and `.storage` entries. Start by tracing how the storage paths are assembled, then verify that a configured directory such as `/Users/me/google_drive/taskbook` contains visible `archive` and `storage` directories and that existing task and note data remains usable.

Written by the indexing model from the issue text.