Added some IL and MN based slacks

[driscoll42]

I added some links to some IL and MN based slacks and fixed some broken links

Add a Slack Group

• [x] Suggestion is not a duplicate
• [x] Suggestion is placed in the proper country according the slack channel’s demographic or if it’s a general channel, it’s placed in the appropriate category
• [x] Name and link are accurate
• [ ] Brief description of the channel is accurate and properly typed

Remove a Slack Group

• [ ] Name of Slack group is present
• [ ] Reason for requesting removal is present