readme: Restructure the readme, improve Getting Started and explanations

[cchudant]

Description

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Restructure the Readme, improve Getting Started and explanations.

Leaving as Draft PR until we can update the "TODO"s

What we may want to change:

• Link to docs may be easy to miss (i think it's ok as long as we can find it easily when we need it)
• Added more links to the documentation, but we may want some more
• I have moved the examples more to the bottom => is it ok or should we display them more
• Rust -> we may want to display it more
• When reading the readme, I can think of some questions one may ask: (i expect them to be the top questions) => we may want to put them in the FAQ section in the docs :)
  • Does my CPU work with Intel SGX? Which one are OK? => we may want a whole documentation page about that and link it in the readme
  • What about speed? Is inference slow on a CPU?
  • Want to learn more about how SGX works (technical audience, with lower level explanation that what our blogposts provide)
  • threat model for Intel SGX in general => is this secure against physical attacks and stuff

Related Issue

None

Type of change

• [x] This change requires a documentation update
• [ ] This change affects the client
• [ ] This change affects the server
• [ ] This change affects the API
• [x] This change only concerns the documentation

How Has This Been Tested?

N/A

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I have updated the documentation according to my changes