[BUG] fix slack invitation link

[wenyuanyu]

Describe the bug
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Environment (please complete the following information):

• GraphScope version: [e.g., v0.1, v0.2.2, master]
• OS: [e.g. MacOS, Linux]
• Version [e.g. 10.15]
• Kubernetes Version [e.g., 1.19]

Additional context
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[yecol]

Thanks for reporting!
a new invitation link is generated:
https://join.slack.com/t/graphscope/shared_invite/zt-m06868qb-dyZvIm6aQrxHVrQ3n8INeg

Could you update the record of
slack.graphscope.io
or
slack.graphscope.app ?

[wenyuanyu]

Thanks for reporting!
a new invitation link is generated:
https://join.slack.com/t/graphscope/shared_invite/zt-m06868qb-dyZvIm6aQrxHVrQ3n8INeg

Could you update the record of
slack.graphscope.io
or
slack.graphscope.app ?

maybe we can use slackin (https://github.com/rauchg/slackin) and host it on aliyun? (https://serverless.aliyun.com/)

[sighingnow]

I think this issue in relative high priority.

[sighingnow]

Unfortunately slackin won't work anymore.. rauchg/slackin#417 rauchg/slackin#417 integrations/slack#1063

[yecol]

fixed manually.