Resolve "update dev environment and readme"

Closes #7

See merge request !6

also, enable bandit and pylint in vscode

Resolve "fix xpath to textgridUri"

Closes #6

See merge request !4

also, lint some

close #6

Resolve "change parent image to alpine"

Closes #3

See merge request !3

reduce vulnerabilites

Resolve "track errors with sentry"

Closes #2

See merge request !2

also, default wsgi config "host" to "localhost" and "port" to "8080" if unset; remove "simple_dc" config

Resolve "prepare Dockerfile and CI for testing image build"

Closes #1

See merge request !1

allow authentication with username only; deliver a RootCollection built from textgrid projects

a `TextgridConfig` class that reads its values from os env; a `EnvNotSetError` that can be raised on config errors; a `TextgridAuth` class that speaks to the textgrid authentication service