Add links to deployment env declare

[mike0sv]

and some other fixes from #397 comments

[codecov]

Codecov Report

Base: 87.62% // Head: 86.82% // Decreases project coverage by -0.80% ⚠️

Coverage data is based on head (6fc99c9) compared to base (d60f3cf).
Patch coverage: 70.93% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.3.0     #440      +/-   ##
=================================================
- Coverage          87.62%   86.82%   -0.81%     
=================================================
  Files                 94       94              
  Lines               7847     7879      +32     
=================================================
- Hits                6876     6841      -35     
- Misses               971     1038      +67     

Impacted Files	Coverage Δ
mlem/cli/apply.py	94.23% <ø> (ø)
mlem/cli/build.py	100.00% <ø> (ø)
mlem/cli/checkenv.py	100.00% <ø> (ø)
mlem/cli/clone.py	100.00% <ø> (ø)
mlem/cli/config.py	95.55% <ø> (ø)
mlem/cli/dev.py	50.00% <ø> (ø)
mlem/cli/import_object.py	100.00% <ø> (ø)
mlem/cli/info.py	97.56% <ø> (ø)
mlem/cli/init.py	100.00% <ø> (ø)
mlem/cli/link.py	100.00% <ø> (ø)
... and 57 more

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[aguschin]

LGTM!