op-reth: port documentation from reth to op-reth

[theochap]

Summary

• Ports OP Stack documentation from the upstream reth repository into op-reth/docs/vocs/, including the OP Stack running guide, sync FAQ, and full CLI reference (64 pages).
• Adds a Vocs-based documentation site with vocs.config.ts, sidebar navigation, package.json, and tsconfig.json configured for op-reth.
• Adds op-reth/justfile with docs-install, docs-dev, docs-build, and docs-preview recipes.
• Adds op-reth-docs-build CircleCI job in .circleci/continue/op-reth.yml that builds the docs via just docs-build.
• Adds bun to mise.toml tooling.

Prompts used

I would like to port the documentation from op-reth from @../reth/ to @op-reth/ . Can you:
- Find all the documentation pages in @../reth/ that refer to crates inside @../reth/crates/optimism/ and move them to @op-reth/ docs.
- Can you make sure that the ported documentation compiles and work in the op-reth destination
- Can you add a circle CI job in @.circleci/continue/op-reth.yml that builds and deploys the documentation. A bit similar to what kona has (kona-docs-build in @.circleci/continue/kona.yml). Import the commands to build the docs from an op-reth justfile recipe.

Can you add bun install to mise.toml?

Test plan

• Verify just docs-build succeeds in op-reth/
• Verify the built site renders correctly (overview, OP Stack guide, CLI reference, FAQ)
• Verify op-reth-docs-build CircleCI job passes

🤖 Generated with Claude Code

[theochap]

Closes #18969

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.7%. Comparing base (48a7a09) to head (6fc10e0).
⚠️ Report is 10 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #18968     +/-   ##
==========================================
- Coverage     75.8%    75.7%   -0.2%     
==========================================
  Files          700      700             
  Lines        71986    71986             
==========================================
- Hits         54574    54500     -74     
- Misses       17266    17342     +76     
+ Partials       146      144      -2     

Flag	Coverage Δ
cannon-go-tests-64	66.4% <ø> (-0.9%)	⬇️
contracts-bedrock-tests	81.6% <ø> (ø)
unit	75.6% <ø> (-0.1%)	⬇️

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see 13 files with indirect coverage changes

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[wiz-inc-a178a98b5d]

Wiz Scan Summary

Scanner	Findings
Vulnerabilities	-
Sensitive Data	-
Secrets	-
IaC Misconfigurations	-
SAST Findings	-
Software Management Findings	-
Total	-

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[sebastianst]

Isolated, moving over docs ✅