Updated Slack join link

[zeeshanjamal16]

The old slack join link was expired. Replaced it with the new slack join link.

Fixes #6

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[Addvilz]

@zeeshanjamal16 please, comment on the relevant task OR create one BEFORE doing something.

You are missing the link in several files - footer, 404, etc. Please grep the whole source base for slack.com and replace the link everywhere.

[zeeshanjamal16]

@Addvilz
Sure. I wiil keep in mind.
I have updated the link in other files as well.

[hbjydev]

Would you be able to store the invite link as a variable in the config.toml to ensure that we never have to go searching for every instance of slack.com again?

An example of how to reference config.toml values can be found in the layouts/partials/meta/site-twittercard.html file.

[zeeshanjamal16]

@hbjydev
Updated hard coded links to config.toml. Can you please check the same?