replace signup form with modal

[vishalvivekm]

Notes for Reviewers

This PR fixes #214

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[vishalvivekm]

[hargunkaur286]

Just a few suggestions:

1. Since this page is about trying out the playground, wouldn't it be better if the modal opens on clicking the big button that comes on the screen, instead of keeping the "try it out" button on top right. I mean, when I opened up the page, my first intuition was that the playground would open when I click that button, but rather, it redirected me to slack.

2. Can we also keep this discussion forum box

3. The video preview image is not visible

4. White colour text on yellow background I think do not go well together. Instead, can we keep the text colour as "black"?

[vishalvivekm]

Thank you @hargunkaur286
I'll address these.

[vishalvivekm]

@hargunkaur286
"Join the community" and Discuss calll out:

any suggestions?

[vishalvivekm]

fixed :-

2. Can we also keep this discussion forum box
3. The video preview image is not visible
4. White colour text on yellow background I think do not go well together. Instead, can we keep the text colour as "black"?