Meta Description Update

[pears-one]

The current HEAD of the Etch template allows you to set a site wide description tag via the "description" config parameter. However I think it would be good to have the option of having a separate description for the posts.

In my preliminary pull request I have set a default fallback of "My Hugo Site". I am happy if people want to set this differently.

[LukasJoswiak]

Hi, thanks for the PR! In my opinion, I'm not sure setting a default value for the description of a site is ideal, because the generic description could override other content on the page that a crawler might decide to use to describe the page. For example, a crawler might see that the description is missing and use the first sentence of the post, which would be more helpful than a generic Hugo description.

However I think it would be good to have the option of having a separate description for the posts

This seems like a reasonable change to me.

[pears-one]

Updated:

• If: .Description exists
  • always prioritise this for meta description value
• else if: .Site.Params.description exists
  • pick this for meta description value
• else: no meta description tag