Revamp of the FAQ

Resolves #994 (closed)

• Added anchors. Visible when hovering on the tabs
• Added "More info:", which links to related sections on getmonero (contributing, user guides, etc)
• Added toc
• Added links to related Moneropedia entries in the answers
• Added side box with more resources and info
• 10 new questions/answers:
  • Can I avoid to download the entire blockchain?
  • why my wallet needs to be scanned everytime I open it?
  • Is it dangerous to run a personal node?
  • Is it dangerous to use a remote node? what's the data a node operator can get from me?
  • How can I contribute?
  • What's the meaning of [technical word]?
  • What wallet should I use?
  • Can't see funds. Did I just lose all my Monero?
  • How can I connect my node via Tor?
  • Why does the blockchain need so much space?

Wha about the monero logo in the toc entries? I'm not 100% sure i like it, if people dislike it i'll just remove it.

The anchor is the "Link" emoji for now, but it's temporary. I plan to substitute it when we switch to an icon pack or something else (see #1075 (closed)):

Preview: