add pic-wall

See merge request codechina/mirrors-settings!345

update github urls

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# Conflicts:
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#   projects/elastic/imports.yml

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# Conflicts:
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#   projects/zhangti0708/imports.yml

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# Conflicts:
#   projects/react-component/imports.yml

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# Conflicts:
#   projects/carson-ho/imports.yml

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# Conflicts:
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#   projects/facebook/imports.yml

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9401-9500

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