Add content to FAQ page

Qinustyrequested to merge
Qinusty/faq into master

What is it?

  • New content
  • Update existing content

Metadata

  • Milestone: %XXX
  • Follow up from: #7 (closed)
  • Topic:
    • Community
    • Management
    • Promotion
    • Code and metadata
    • BuildStream description
    • Outcomes
    • Landing/Project page

Rationale

Adding content to answer various FAQs. This MR also starts to use local links e.g. [faq](faq.html) instead of [faq](https://buildstream.build/pages/faq.html)

Edited by Qinusty

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