Update docs design

[vannyle]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  This pull request introduces the following updates:

  • update the documentation design (for both dark & light themes),
  • upgrade dependencies
  • setup prettier and eslinter
  • enable respectPrefersColorScheme - change theme using user system preferences (learn more here)

• What is the current behavior? (You can also link to an open issue here)
  The documentation before:

• What is the new behavior (if this is a feature change)?

• Other information:
  TODO:
• integrate algolia search
• add social preview
• remove all example pages

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Name	Status	Preview	Updated
docs	✅ Ready (Inspect)	Visit Preview	Jun 21, 2022 at 11:26AM (UTC)

[lnikell]

Few more action points:

• dark mode switcher
• replace font with a bit bolder one, something wrong with a current one
• it feels the size of headers is a bit wrong and too big, i will check.