feat: added plugin registry to docs

[jdx]

From jdx/mise-docs#58

Co-authored-by: taskylizard 75871323+taskylizard@users.noreply.github.com

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.05%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ea31a39)	16606	13556	81.63%
Head commit (41f6c76)	16606 (+0)	13565 (+9)	81.69% (+0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#2138)	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: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[github-actions]

Package	Line Rate	Complexity	Health
src	87%	0	✔
src.cli	84%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	96%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	95%	0	✔
src.cli.config	92%	0	✔
src.cli.direnv	80%	0	✔
src.cli.plugins	89%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	29%	0	❌
src.cli.tasks	71%	0	➖
src.config.config_file	89%	0	✔
src.config	87%	0	✔
src.forge	77%	0	✔
src.plugins.core	56%	0	➖
src.plugins	84%	0	✔
src.shell	98%	0	✔
src.toolset	85%	0	✔
src.ui	67%	0	➖
Summary	82% (13565 / 16606)	0	✔