Change prop name "pathContext" to "pageContext"

[KyleAMathews]

This when creating pages you can add a context key. All data passed there is passed into pages as pathContext. I think pageContext is a more intuitive name as its context for the "page" which is the main object not "path", an attribute of the page.

Since we're at 1.0, we can just pass in both and then remove pathContext at the next major release.

Any thoughts?

[Vagr9K]

pageContext is less confusing IMO.

Maybe gatsby can throw warnings when building with deprecated pathContext?
Then, it wouldn't be a surprise in 2.0.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[monsieurnebo]

Totally agree, pathContext is confusing. pageContext will definitly fit better!

[calcsam]

Merged into v2 branch. Going to close this.