cleanup base package.json + fix foundry gh action

[technophile-04]

Description:

• remove unnecessary stuff from base package.json + vercel ignore from root
• add gitignore inside deployments + remove unecessary workflow from foundry package

For 2nd point checkout #43 (comment), although CLI generated deployments/31337.json dir but while pushing it to github the whole deployments dir was not tracked since 31337.json is only file in deployments and was ignored too and this causes the yarn deploy to fail in github actions (since deployments dir is not present on github). But yarn deploy works nicely locally since its generated by CLI and then ignored with .gitignore.

To make yarn deploy work in foundry we need to make sure atleast empty deployments is present (something we could fix in scaffold-eth#867 or after in other PR) but for now I think this is fine.

[rin-st]

Tested and it working great, thanks!