Merge branch 'topic/default/change-mercurial-link' into 'branch/default'

Doc: change Mercurial link

See merge request fluiddyn/fluidfft!63

Author: paugier

CONTRIBUTING.md

@@ -24,4 +24,4 @@ repositories are hosted here: <https://foss.heptapod.net/fluiddyn>.
 Please read our documentation on [developer
 essentials](https://fluiddyn.readthedocs.io/en/latest/advice_developers.html),
 and especially on [setting up
-Mercurial](https://fluiddyn.readthedocs.io/en/latest/mercurial_heptapod.html).
+Mercurial](https://fluidhowto.readthedocs.io/en/latest/mercurial.html).

doc/build-from-source.md

@@ -20,7 +20,7 @@ Mercurial extensions like [Evolve] and [Topic]. The main repository is hosted
 
 There are other ways to get the source but we are going here to assume that you
 can install [Mercurial]. It can be useful when working with Fluidfft source to
-[fully setup Mercurial with these extensions and learn a bit of Mercurial](http://fluiddyn.readthedocs.org/en/latest/mercurial_heptapod.html).
+[fully setup Mercurial with these extensions and learn a bit of Mercurial](https://fluidhowto.readthedocs.org/en/latest/mercurial.html).
 Then, the Fluidfft repository can be cloned with
 
 ```sh