Added discussion links

[dldisha]

Issue Description

To display an external link to the discussion forum and add a link to the corresponding discussion at the bottom of each tutorial on the website.

Fixes #1504

Changes Made

After:

External link:

Discuss link at the bottom of each tutorial:

If this seems fine, I'll add the same link at the bottom of other tutorials also. :)

• Please check if the PR fulfills these requirements

• PR is descriptively titled and links the original issue above
• Before/after screenshots (if this is a layout change)
• Details of which platforms the change was tested on (if this is a browser-specific change)
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[patricoferris]

Hi @dldisha thanks for this PR.

In your description of it you say

add a link to the corresponding discussion at the bottom of each tutorial on the website

Unless I'm mistaken, it looks like you've only added it the main learn page and the up_and_running tutorial? Is this intentional?

[dldisha]

Yes @patricoferris, because I first wanted a mentor to check my code changes as this is just a test(I guess). And if that all seems fine I'll do the same for each tutorial. Didn't want to pile up the wrong commits.
So should I move forward with other tutorials?

[gs0510]

@dldisha You can go ahead and add it to all tutorials :) Thanks!

[dldisha]

@gs0510 Done! please check.

[gs0510]

@dldisha Thanks! Can you rebase your PR against master to remove the conflicts? Thanks! :)