Help and introduction text for config pages/settings and helpers

There is some serious need for some introduction text on top of config pages, and the various settings, together with helpers.
Some better descriptions of what to expect when some settings are turned on/of, or what certain pages are for and what it exactly does to a helper/entity/setting.

This could be brief and short, followed by a link to the help-text and documentation of the home assistant website for further reading and explanation.

This will definatly help users to better understand things and get to the proper documentation, instead of Googling and finding out of date information.