Replace Slack home page with Slack invitation

[jackwener]

I think that the link of Slack channel should be the invitation.
Other open source projects are like this, such as Istio, TiDB, Pulsar.
Fix #1262.

[jamieliu1023]

@jackwener Thanks for your contribution to the Nebula Graph community! This is Jamie with Nebula and I'd like to email you the Nebula Contributor certificate and ship you a mug to mark this special moment. Could you please kindly reach me via jamie.liu(at)vesoft.com? Again, thanks for being a part of the Nebula community!

[jackwener]

Hi, I'm pleased to receive the message.

…

On Mon, Jul 19, 2021 at 4:50 PM jamie.liu ***@***.***> wrote: @jackwener <https://github.com/jackwener> Thanks for your contribution to the Nebula Graph community! This is Jamie with Nebula and I'd like to email you the Nebula Contributor certificate and ship you a mug to mark this special moment. Could you please kindly reach me via jamie.liu(at) vesoft.com? Again, thanks for being a part of the Nebula community! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1266 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHI4SLIE5IFJK6GK2GR3CTDTYPROTANCNFSM5AS3TFKA> .

[wey-gu]

Thank you @jackwener :)

[jamieliu1023]

Hi jackwener, Thanks for the quick response! Please let me know the shipping address by filling in this questionnaire: https://wj.qq.com/s2/7782511/2cef/ We will be sending your mug shortly. Regards, Jamie

________________________________ 发件人: 卡比卡比 ***@***.***> 发送时间: 2021年7月19日 16:57 收件人: vesoft-inc/nebula-graph ***@***.***> 抄送: Jamie Liu ***@***.***>; Review requested ***@***.***> 主题: Re: [vesoft-inc/nebula-graph] Replace Slack home page with Slack invitation (#1266) Hi, I'm pleased to receive the message.

On Mon, Jul 19, 2021 at 4:50 PM jamie.liu ***@***.***> wrote: @jackwener <https://github.com/jackwener> Thanks for your contribution to the Nebula Graph community! This is Jamie with Nebula and I'd like to email you the Nebula Contributor certificate and ship you a mug to mark this special moment. Could you please kindly reach me via jamie.liu(at) vesoft.com? Again, thanks for being a part of the Nebula community! ― You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1266 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHI4SLIE5IFJK6GK2GR3CTDTYPROTANCNFSM5AS3TFKA> .

― You are receiving this because your review was requested. Reply to this email directly, view it on GitHub<#1266 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ANVOAEMGVENUDN2XX5CNGY3TYPSGZANCNFSM5AS3TFKA>.