Re-export pageTitle from index

[gossi]

For sweeter usage from gjs/gts file, especially since ember-route-template exists now, you can write this:

import { pageTitle } from 'ember-page-title';

<template>
  {{pageTitle "About"}}
  
  ...
</template>

because nobody has time for this:

import pageTitle from 'ember-page-title/helpers/page-title';

<template>
  {{pageTitle "About"}}
  
  ...
</template>

which also feels like calling internal, forbidden API (though, yeah I know isn't - but still feels like).

[gossi]

As much as I felt required to update embroider at the addon itself, the test-app needs to bump to the latest embroider, too. If this has happened, this PR can continue 👍

[NullVoxPopuli]

I'm a big fan of this

[NullVoxPopuli]

Any chance you can fix C.I. in another PR? looks unrelated

[knownasilya]

Not sure what's up with the tests, they keep timing out.. like they pass but time out after?

[NullVoxPopuli]

looks like embroider/test-setup may need to be updated

[NullVoxPopuli]

a basically no-op change here has CI fully passing, #265

so I think the @embroider/addon-dev change caused the failures. I'll address in a separate PR