build: update tsconfig target and remove dist folder from git repo

[glebedel]

Reachdesk is getting this error:

ERROR in ./node_modules/@stackone/react-hub/dist/index.esm.js 126:32
Module parse failed: Unexpected token (126:32)
File was processed with these loaders:
 * ./node_modules/babel-loader/lib/index.js
You may need an additional loader to handle the result of these loaders.
|     "open" !== r && "closed" !== r && (a ? "opening" === r && n("closed") : s || "opening" === r && o && (n("open"), Connect.start(_objectSpread(_objectSpread({}, o), {}, {
|       onClose: () => {
>         n("closed"), o.onCancel?.();
|       }
|     }))));

This is because of the tsconfig target building for ESNext which supports features like optional chaining and type coalescence.
We could go lower than ES2018 (eg: to ES2016) if we think there's a risk T2s use non-ES2018 compatible browsers.

Also removing the dist folder as it shouldn't be needed (and removing it from .releaserc git plugin config should prevent it from being committed again)

[github-actions]

🎉 This PR is included in version 1.0.11 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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