CONTRIBUTING now part of side menu on pkgdown website

[peterdesmet]

The new website uses pkgdown 1.3.0.9100, which automatically includes CONTRIBUTING and CODE OF CONDUCT in the side menu:

That means we don't have to explicitly link to it CONTRIBUTING in the navbar:

https://github.com/ropensci/wateRinfo/blob/3918e6b4d34a25739b5914edbd1b73adc0c53564/_pkgdown.yml#L33-L34

We don't have to define a navbar at all (but use the default) if we are fine with:

• Not having contributing in the navbar
• Not having the twitter icon in the navbar (fine with me, especially since website is now included)
• Using "articles" rather than "tutorials" (see https://github.com/ropensci/wateRinfo/pull/53#discussion_r261395447)
• Having the home icon back

See https://inbo.github.io/inborutils/ for an example

@stijnvanhoey, your call. 😄

[stijnvanhoey]

I'm always been keen on the custom navbar and using tutorials instead of articles, you know ;-). But, in sake of uniformity/consistency and simplicity (less customization) , I'm fine with the changes and having the default navbar...

[peterdesmet]

☺️ Yay! Before I do that, I noticed something odd with the titles of the articles. I created a separate issue for this: #68

[peterdesmet]

Note that changelog is also included (https://ropensci.github.io/wateRinfo/news/index.html) by using the default navbar.