The command tool does not correctly parse custom substitution parameters

[teo-tsirpanis]

If we run dotnet fsdocs build --parameters foo bar yoshi sbubby, the command tool prints

Substitutions/parameters:
  foo --> bar
  bar --> yoshi
  yoshi --> sbubby

while the correct answer should have been

Substitutions/parameters:
  foo --> bar
  yoshi --> sbubby

Moreover, if we pass an odd number of arguments to --parameters the tool should fail but it doesn't.

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The problem is that the function that parses the arguments uses Seq.pairwise which groups the items of a sequence in overlapping pairs.