Add Vale to documentation builds

[justinegeffen]

This PR introduces Vale to be used for:

• Spelling errors
• Header checking
• Link checking (internal and external)
• Updated word lists to include Seqera terminology
• Removed Contractions.yml as we prefer not to use contractions in our content
• Removed some terms from the word list

To be added:

• A better way to identify where the errors are, line by line

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[christopher-hakkaart]

I'm actively reviewing this. Something in my VS Code isn't working with Vale. I can see it working in the PR, but it's not clear why it's not working locally. I'll investigate as part of the review.

[justinegeffen]

I'm actively reviewing this. Something in my VS Code isn't working with Vale. I can see it working in the PR, but it's not clear why it's not working locally. I'll investigate as part of the review.

I suspect it's something that Cursor AI might have done - I have deleted one possibly problematic file. LMK if there are still issues on your side.

[christopher-hakkaart]

It works for me locally again. The problems list can be overwhelming, however, I thing it's a huge net improvement and we can assess updating lists and turning things on and off once it's implemented. It's a go ahead from me.