Add prelude-yaml
Update README and move some packages to helm-everywhere

Add Helm to table of contents and move helm-descbinds and helm-eshell to
helm-everywhere module.
Merge pull request #661 from tuhdo/master

Add Helm to the table of contents and move some packages to helm-everywhere
Merge pull request #647 from ToBeReplaced/prelude-yaml

Add prelude-yaml
Merge remote-tracking branch 'upstream/master'
activate prelude-yaml