Curriculum: Update MongoDB tutorial/instructions

[lalpert]

The MongoDB tutorial recommended (https://www.youtube.com/watch?v=4yqu8YF29cU&feature=youtu.be) in the MongoDB lesson suggests making multiple web accounts, including to a site that was since acquired and can't be used anymore (mLab). I think the accounts are only needed to deploy the software at the end of the tutorial. We should either find a different tutorial that's more up to date, or add instructions to the curriculum possibly saying to skip the login + deployment parts of the tutorial.

[alodahl]

@lalpert will you work on this, or should I hand it to volunteers?

[lalpert]

If a volunteer is up for it that would be great.

[Yugandhartripathi]

I would like to work on this.

[yati1998]

@alodahl if this issue isn't solved yet, can I work on this?

[Yugandhartripathi]

@alodahl Please reassign this to @yati1998 I am sorry but I couldn't find time got busy with some college and personal assignments