Update Hugo to 0.76.5 and fix a warning

Created by: flora8984461

Part of https://github.com/EclipseFdn/hugo-solstice-theme/issues/176

There was a warning: WARN 2020/10/30 16:49:36 Page.URL is deprecated and will be removed in a future release. Use .Permalink or .RelPermalink. If what you want is the front matter URL value, use .Params.url

And I change the .URL in <resources.html>'s "view more" to .Permalink and fixed.

Signed-off-by: Yi Liu yi.liu@eclipse-foundation.org