feat(website): migrate to nextra

[d1onys1us]

You can view the deployment here: https://website-git-feat-nextra-website-taikoxyz.vercel.app/

summary of changes

• update from docusaurus v2 -> nextjs 13 (nextra)
• upgrades from mdx v1 -> mdx v2
• removes docusaurus css pollution, now it is using tailwind
• darken the overall theme
• shiki code highlighting
• add full (in memory) text search for docs
• add taiko status page to navigation bar
• update bridge links to point to new faucet link
• lighthouse performance bump, much faster

the bad parts

• no more twitter/reddit in the navigation bar, for now. (can fix this later, but it is in footer). (eventually we may want to separate out "landing page" and "docs page" which sit at taiko.xyz and docs.taiko.xyz, but can do this effort after flushing out the docs with whitepaper material).
• should optimize the SEO a bit

[codecov]

Codecov Report

Merging #12947 (f684736) into main (59276fe) will decrease coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #12947      +/-   ##
==========================================
- Coverage   66.67%   66.41%   -0.27%     
==========================================
  Files         113      113              
  Lines        3034     3034              
  Branches      356      356              
==========================================
- Hits         2023     2015       -8     
- Misses        935      943       +8     
  Partials       76       76              

Flag	Coverage Δ		*Carryforward flag
bridge-ui	95.05% <ø> (ø)
protocol	59.10% <ø> (-0.51%)	⬇️
relayer	69.10% <ø> (ø)		Carriedforward from d50f5da
ui	100.00% <ø> (ø)		Carriedforward from d50f5da

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
packages/protocol/contracts/bridge/Bridge.sol	59.37% <ø> (ø)
...ges/protocol/contracts/libs/LibAnchorSignature.sol	89.47% <0.00%> (-10.53%)	⬇️
...es/protocol/contracts/thirdparty/LibMerkleTrie.sol	83.13% <0.00%> (-7.23%)	⬇️

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[dong77]

Looks great, the navbar font size is a bit too small (even bigger than the footer fonts)