back interdiff of round #5 and #4

feat: add language statistics to repo page #208

files
appview
pages
templates
layouts
repo
repo
knotserver
types
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appview/pages/pages.go

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appview/repo/repo.go

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knotserver/routes.go

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types/repo.go

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appview/pages/templates/layouts/repobase.html

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appview/pages/templates/repo/index.html

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