Migrate to poetry. Get rid of using pure pip

[alexbojko]

Solves this issue #15

[aih]

@alexbojko I've updated the README and tested 'poetry install'. It works. However, it's not clear to me:
1- whether billtitleindex can now be used as a Python package and
2- if so, what does it contain? I see that I can run from billtitleindex import *, but I don't see what the structure is of that package (it doesn't seem to have a btiapp). Maybe we need to add the billtitleindex namespace for internal imports:

File "/Users/arihershowitz/Documents/workspace/billtitleindex/src/billtitleindex/btiapp/utils.py", line 11, in <module>
    from btiapp.models import BillBasic

Should this be from billtitleindex.btiapp.models import BillBasic?

[alexbojko]

you are right about from billtitleindex.btiapp.models import BillBasic

as a package it should be used exactly that way

[sonarqubecloud]

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[alexbojko]

no need