Make it easy to create new interactive roadmaps

[nileshtrivedi]

The Roadmap component currently hardcodes all the markdown data for Golang roadmap: https://github.com/learn-awesome/learndb/blob/main/src/Roadmap.svelte

We need to separate the content from this component and load it from JSON/Markdown files elsewhere in the repo. The end goal is to make it really easy to create interactive roadmaps for new topics.

[A-HK]

@nileshtrivedi Will work on this too as a part of #63

[PR454D]

Hey @nileshtrivedi, I would like to participate in this.. Will ask you if I have any doubts..

[nileshtrivedi]

Sure, @PR454D . Do check out the existing Roadmap.svelte and roadmapAlt.svelte components.