Update to docs: /building-apps/project-setup/

[AasmundEndresen]

What did you do?

I was setting up a project following this tutorial and encountered some places the docs should be updated

The tutorial her prompts to name the component 'stellar-wallet', but later in the tutorial refers to it as 'wallet.tsx'.

Also named exports are now handled automatically by stencil, so its not necessary to install @rollup/plugin-commonjs as a dependency:

Or to define the config for how to handle these:

Also the css variables used in the two stylesheets are not defined anywhere in the project and will produce error, so they can be omitted from the tutorial code (Since most people will just copy+paste this css as suggeted): stellar-wallet.scss style.scss