todo: replace all relative links in readme to `https://github.com/near/cargo-near/blob/main/...` form for normal render on crates.io

[dj8yfo]

also adding these at the top of readme would be nice

    <a href="https://near.chat"><img src="https://img.shields.io/discord/490367152054992913?style=flat-square&label=discord&color=lightgreen" alt="Join the community on Discord" /></a>
    <a href="https://t.me/NEAR_Tools_Community_Group"><img src="https://img.shields.io/badge/telegram-online-lightgreen?style=flat-square" alt="Join the community on Telegram" /></a>