[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
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (d6ee64c5d89c9314d609eb68c7ed0aecaa08b472) | 3475 | 3044 | 87.60% | | | Head commit (7b2965267dd7c7efd39fb754f0b9612f8eea7e6c) | 3474 (-1) | 3043 (-1) | 87.59% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#283) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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