Constant morphisms - #332
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This PR adds three properties of morphisms:
It resolves another part of #267.
The properties have been decided for all morphisms in the database (but this was not so much work since there are not many morphisms yet).
Unfortunately, not many implications could be added, and the other results needed to be added as lemmas on a content page. This is basically because the implication model is not flexible enough and there is no structure type "objects" yet (with properties like "subterminal").
For example, we have the result: if$f : X \to Y$ is a morphism and $X$ is subterminal, then $f$ is constant. Currently, this cannot be added as an implication.
While working on this PR, I have also improved the nLab pages on constant morphisms and zero morphisms.