Delete request lib because it's not being used

[shannonwells]

The faucet is actually not even using the deprecated request package. So it's removed from package.json. I tested only with a localhost against a local chain, because the request package was originally used only by the faucet server.

Closes #24

To verify

1. first launch a local frequency chain.
2. launch the server

git fetch -ftp
git co feat/replace-request
yarn install --frozen-lockfile && yarn dev

3. launch the client in another terminal

cd client
yarn install --frozen-lockfile && yarn dev -- --open

4. Fill in the faucet form with a valid address and submit.
5. Verify that the address receives 10 UNIT