Feature: Hide tokens and secrets

[oysandvik94]

Find a good way so that secrets and tokens are not exposed in the scratch buffer.

Easist solution is using env variables (this might already work), but will try and come up with a nice idea.

[oysandvik94]

Env vars are supported, see https://github.com/oysandvik94/curl.nvim?tab=readme-ov-file#-persistence

But will think of a more sophisticated way of doing stuff

[oysandvik94]

rest.nvim has a function for loading env files: https://github.com/rest-nvim/rest.nvim

Probably a good idea.

[oysandvik94]

See #19 (comment)