website: Use canonical URLs for learn.hashicorp.com links
website: Use canonical URLs for learn.hashicorp.com links

The .html suffix redirects correctly, but it's not the 'real' path and thus
can throw off analytics.

pryorda/terraform,pdecat/terraform,heimweh/terraform,rnaveiras/terraform,tommynsong/terraform,rnaveiras/terraform,ewbankkit/terraform,hashicorp/terraform,apparentlymart/terraform,heimweh/terraform,ewbankkit/terraform,ewbankkit/terraform,apparentlymart/terraform,VladRassokhin/terraform,apparentlymart/terraform,rnaveiras/terraform,pdecat/terraform,ewbankkit/terraform,VladRassokhin/terraform,pryorda/terraform,heimweh/terraform,pryorda/terraform,hashicorp/terraform,tommynsong/terraform,tommynsong/terraform,VladRassokhin/terraform,pdecat/terraform,VladRassokhin/terraform,heimweh/terraform,apparentlymart/terraform,heimweh/terraform,apparentlymart/terraform,hashicorp/terraform,pdecat/terraform