Revert "main/postmarketos-ui-phosh: add yelp to _pmb_recommends (MR 2832)" (MR 3196)

The patch was meant well. But there are problems with yelp in its
current form in postmarketOS:
* It's practically empty. In the default install, there is only one
  application that has some sort of help text, which is Chatty. But
  when you click on the entry, there is only one line of generic
  information about the app. Not useful for users.
* Yelp is not adapted for small screens, the one line of help text is
  cut off on the PinePhone.

So let's not ship it by default in edge and v22.06 for now.
This reverts commit 5ef50b12.

[ci:skip-vercheck]: modifying _pmb_recommends doesn't need a version
bump.

main/postmarketos-ui-phosh/APKBUILD

@@ -47,7 +47,6 @@ _pmb_recommends="
 	postmarketos-welcome-gtk3
 	ttyescape
 	xdg-user-dirs
-	yelp
 	"
 _pmb_groups="feedbackd"
 subpackages="$pkgname-qt_tweaks $pkgname-firefox"