Nushell 0.33: Syntax Highlighting Themes and New Commands

2nd chunk of `blog/2021-06-22-nushell_0_33.md`

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_Nu, with configurable colors_

You can now configure the colors used in syntax highlighting. For the currently supported token types and examples, check out [the original PR](https://github.com/nushell/nushell/pull/3606).

## New commands

- nathom added [`unlet_env` to remove environment variables from the current scope](https://github.com/nushell/nushell/pull/3629)
- sophiajt added the [`ignore` command to ignore pipeline output](https://github.com/nushell/nushell/pull/3643)
- fdncred added [`ansi gradient` command](https://github.com/nushell/nushell/pull/3570)

## Additional improvements

- fdncred added [path and environment path separators to `char`](https://github.com/nushell/nushell/pull/3660) to allow for creating more portable scripts, fixed an issue with [error colors](https://github.com/nushell/nushell/pull/3634), added [single and double quote to char](https://github.com/nushell/nushell/pull/3601), [version now lists plugins](https://github.com/nushell/nushell/pull/3548)

Title: Nushell 0.33: Syntax Highlighting Themes and New Commands

Summary

Nushell 0.33 introduces configurable syntax highlighting colors and several new commands, including `unlet_env` for removing environment variables, `ignore` for suppressing pipeline output, and `ansi gradient` for creating ANSI gradients. Also, the path and environment path separators are added to the `char` command.