Etan Kissling 613f4a9a50
accelerate EL sync with LC with --sync-light-client (#4041)
When the BN-embedded LC makes sync progress, pass the corresponding
execution block hash to the EL via `engine_forkchoiceUpdatedV1`.
This allows the EL to sync to wall slot while the chain DAG is behind.
Renamed `--light-client` to `--sync-light-client` for clarity, and
`--light-client-trusted-block-root` to `--trusted-block-root` for
consistency with `nimbus_light_client`.

Note that this does not work well in practice at this time:
- Geth sticks to the optimistic sync:
  "Ignoring payload while snap syncing" (when passing the LC head)
  "Forkchoice requested unknown head" (when updating to LC head)
- Nethermind syncs to LC head but does not report ancestors as VALID,
  so the main forward sync is still stuck in optimistic mode:
  "Pre-pivot block, ignored and returned Syncing"

To aid EL client teams in fixing those issues, having this available
as a hidden option is still useful.
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Documentation

material for mkdocs

The Nimbus guide is generated using Material for mkdocs, and installed using a python VENV (see Makefile).

mdbook

Some books in this folder were produced using mdBook - see installation guide.

# Install or update tooling (make sure you add "~/.cargo/bin" to PATH):
cargo install mdbook --version 0.4.18
cargo install mdbook-toc --version 0.8.0
cargo install mdbook-open-on-gh --version 2.1.0
cargo install mdbook-admonish --version 1.7.0

# Work on the book locally - open "http://localhost:4000" for live version
cd docs/the_nimbus_book
mdbook serve -p 4000

# Create a local copy of the book
make book

# Publish book using makefile (in the top-level dir)
make publish-book