docs(nodes): hugepages tutorial (aleph-vm 2.0)

[odesenfans]

Adds `docs/nodes/compute/advanced/hugepages/` and a sidebar entry under Compute Nodes → Advanced Features.

Covers, for CRN operators on aleph-vm 2.0:

• prerequisites: Rust supervisor (`ALEPH_VM_SUPERVISOR_IMPL=rust`) and a host with more than one NUMA node
• how NUMA placement + hugepage backing work, and the fail-safe fallbacks
• `ALEPH_VM_NUMA_HUGEPAGES`, `_HEADROOM_MB`, `_LIMIT_MB` with a worked example
• verification via supervisor logs, `/proc/meminfo`, sysfs and the QEMU memory-backend argv
• 1 GiB pages (operator-reserved via the kernel cmdline), disabling, troubleshooting

Independent of the volume-pools PR; both touch adjacent lines of the sidebar config, so whichever merges second needs a trivial rebase.

🤖 Generated with Claude Code

https://claude.ai/code/session_01WuSSYXc921wiHCUweF1ANC

[github-actions]

Deployed on:

• https://bafybeig5clihefvum35zr4uh7gqvz5i4isstqcx6tbtyaxqnif2enx4wxq.ipfs.aleph.sh

Preview for this pull request, updated on every commit and removed once the PR is closed.

[foxpatch-aleph]

Well-structured documentation for a new aleph-vm 2.0 hugepages feature. The build passes cleanly, the sidebar entry is correctly placed and linked, the internal anchor link is valid, and the worked example math is correct (192 GiB limit is properly binding on a 256 GiB / 2-node host with 16 GiB headroom per node). The content covers prerequisites, how-it-works, configuration, verification, 1 GiB pages, disabling, and troubleshooting comprehensively. All VitePress container blocks are properly opened and closed. No security concerns — the doc describes standard root-level kernel operations with no credentials or injection vectors.