feat(styles): adjust webpack config to manually load pf stylesheets

[seanforyou23]

This PR improves developers experience around working with patternfly in development mode. Previously, there were so many inline style tags that understanding what styles are applied and where they are coming from was a real pain. This PR applies a null-loader for any styles coming from @patternfly/react-styles/css/*, and instead manually loads required styles via standard import statements. This drastically reduces the number of inline style tags a developer needs to wade through when reasoning about styles loaded an the application.

One issue I've noticed is that jest isn't happy about these changes, and throws the following error when running the test suite. Probably needs an adjustment to moduleNameMapper in the jest config, but I haven't figured this bit out yet.

I'm not sure we actually want to merge this work into master, maybe an example branch accompanied by a wiki entry would be better? I personally prefer this as the default experience, because it's clean and there are less "surprises" to come across when building a UI, but would definitely like to get some others input on this.

#47

null load styles automatically injected from react-styles
fix typo in readme
update patternfly deps
use a landmark region
manually load required styesheets

[dgutride]

I'm concerned about the appearance of this being our primary recommended approach. I think our main use case should be the simplest one where people use the react base css and embedded styles per component. Otherwise they have to manually pull stylesheets or they get the whole thing. We've gotten feedback that our component based loading has been well received and greatly simplified usage (as well as bundle size). I'd much rather we include a different example somehow that shows advanced configuration options.

[seanforyou23]

I can move it to an example branch/wiki entry for those who might be interested. It really amounts to just a couple of changes, half of this PR is the lock file adjustments anyway :) - cool thx for the feedback!