docs: update theme 1.8 #2684

	# This workflow builds the book with documentation and runs book tests
	name: Book

	on:
	push:
	branches:
	- main
	- 'branch-*'
	pull_request:
	branches:
	- main
	- 'branch-*'

	env:
	CARGO_TERM_COLOR: always
	RUST_BACKTRACE: full

	jobs:
	build:
	runs-on: ubuntu-latest
	timeout-minutes: 30
	services:
	scylladb:
	image: scylladb/scylla
	ports:
	- 9042:9042
	options: --health-cmd "cqlsh --debug scylladb" --health-interval 5s --health-retries 10
	steps:
	- uses: actions/checkout@v3
	- name: Update rust toolchain
	run: rustup update
	- name: Install mdbook
	run: cargo install mdbook --no-default-features
	- name: Build the project
	run: cargo build --verbose --examples
	- name: Build the book
	run: mdbook build docs
	- name: Run book tests
	run: mdbook test -L target/debug/deps docs

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