Added homepage attribute to LinksResource

[ml-evs]

See #115

[CasperWA]

Seems there's some trouble concerning getting the tests to run.

And I could swear i already did this, but maybe that was for something else? Oh well :)

Looking good 👍

[CasperWA]

I'll look at this next week hopefully.

EDIT: Scratch that. Figured out the issue (see below).

[CasperWA]

This is blocked until Materials-Consortia/providers#7 has been merged, adding homepage to all providers.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e333304). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #127   +/-   ##
=========================================
  Coverage          ?   83.05%           
=========================================
  Files             ?       39           
  Lines             ?     1841           
  Branches          ?        0           
=========================================
  Hits              ?     1529           
  Misses            ?      312           
  Partials          ?        0

Flag	Coverage Δ
#unittests	83.05% <100%> (?)

Impacted Files	Coverage Δ
optimade/server/routers/utils.py	83.33% <ø> (ø)
optimade/server/main.py	92% <100%> (ø)
optimade/models/structures.py	88.28% <100%> (ø)

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[CasperWA]

This is fine now - let's merge.

Thanks @ml-evs !