[patch] Canonical macro self-variable

[liamhuber]

Switches the self-like argument in macro-defining functions over to self, except for a few cases where we leave it as wf and explicitly tell the story about how you may be working with a worklfow and want to convert it to a macro by copying and pasting.

Also cleaned up some other non-breaking problems with the pedagogical text (english, some variable names, non-impactful code statements, etc.) and tidied up some unused imports.

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Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

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	Coverable lines	Covered lines	Coverage
Common ancestor commit (d6ee64c)	3475	3044	87.60%
Head commit (7b29652)	3474 (-1)	3043 (-1)	87.59% (+0.00%)

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	Coverable lines	Covered lines	Diff coverage
Pull request (#283)	0	0	∅ (not applicable)

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