[Merged by Bors] - chore(Tactic/Linter): unicode linter documentation improvements

[adomasbaliuka]

As planned in #36773, we add a link to the style guide, which was updated at leanprover-community/leanprover-community.github.io#820.

Further changes:

• some more documentation updates (some obsolete comments were talking about a "blocklist" which no longer exists)
• change order of checks in isAllowedCharacter. The new order is more logical and may slightly improve performance (which probably doesn't matter) since Mathlib has more characters in otherInMathlib than emojis.

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I linked to the file in the GitHub repo, not the website, so people can immediately edit the content when needed.

[github-actions]

PR summary 00dbc4ec64

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[grunweg]

I would have expected a link to the webpage, but the rendered link on github looks pretty enough. Thanks!
bors d+

[adomasbaliuka]

I made some more doc changes.

@grunweg Sorry for the question but how can I look at the modified website? Do I have to clone https://github.com/leanprover-community/mathlib4_docs and build locally?

[grunweg]

I almost never look at the modified website: the webpages are essentially markdown (so it's mostly clear how it will look), that how I get by. Do you need to do so for your PR?

[grunweg]

The other changes looks good to me. Can you update the PR description accordingly? (Otherwise, feel free to mark your PR as ready for review and merge it yourself.)

[adomasbaliuka]

Mainly I just thought I should know how to build the docs.

Also, I should check what it looks like at some point as part of "testing" my changes. But if it's hard, I can also wait until it's actually merged and check then. Thanks!

[adomasbaliuka]

bors merge

[mathlib-bors]

🔒 Permission denied

Existing reviewers: click here to make adomasbaliuka a reviewer

[grunweg]

Ah, you mean mathlib's docs! Same answer, I guess.

[grunweg]

bors merge

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• ci (staging) / Build
• ci (staging) / Post-CI job
• ci (staging) / Post-Build Step
• ci (staging) / Lint style