Add package.json for aphlict

Summary: This makes the whole setup easier, future proof and reproducible.

Test Plan:

cd support/aphlict/server/
npm install

See that ws gets installed as expected.

Reviewers: O1 Blessed Committers, Matthew

Reviewed By: O1 Blessed Committers, Matthew

Subscribers: Matthew, Ekubischta, speck, tobiaswiese

Maniphest Tasks: T15019

Differential Revision: https://we.phorge.it/D25006