Clean up ColdFusion section of Community drivers page

Description

For https://docs.mongodb.com/ecosystem/drivers/community-supported-drivers/:

1. Remove the blog posts to mxunit.org since that site is now offline
2. Remove the 3rd link to http://github.com/virtix/cfmongodb/tree/0.9 since this is last updated 2010, and the first link is a more updated fork of this
3. Remove the 4th link since that site is down also.

This will leave just the first link.

PS. I thought it might be useful to link to SO with tags in place, but there's not much good content there either.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)