[Cashtab] Webpack upgrade part 6, feature freeze and source code copy
Summary:
T1682
Feature freeze on Cashtab repo. This is the first step that begins migrating the Cashtab codebase to upgraded webpack framework.
This diff implements step 6 of T1682. This is what the repo looks like after those scripts were run.
Test Plan: Confirm all files from web/cashtab were copied to to web/cashtab-v2 with the exception of package.json, package-lock.json, build/, coverage/, scripts/, (though you want scripts/addGenerated.sh and scripts/extension.sh), and node_modules
Reviewers: #bitcoin_abc, kieran709
Reviewed By: #bitcoin_abc, kieran709
Differential Revision: https://reviews.bitcoinabc.org/D11246