Proposal: Hindi translation track, starting with the Getting Started lessons

Hi @yunwei37! I'd like to propose adding a Hindi translation track to the tutorial, starting small.

**Why:** There is currently no Hindi eBPF learning content anywhere - no tutorials, videos, or labs (I searched hard; the only Hindi presence in the ecosystem is ebpf.io's single translated page). Hindi-language developer education is a proven, large market in India, and this repo already maintains English + Chinese, so a third language follows the pattern you've established.

**What I'm proposing for a first PR:**

- `README.hi.md` next to the existing `README.md` / `README.zh.md`, starting with the Getting Started lessons: `src/0-introduce` and `src/1-helloworld` (happy to add `src/2-kprobe-unlink` too)
- Same heading structure as the English lesson; code blocks, commands, and technical terms (kprobe, verifier, CO-RE) stay in English - same approach `README.zh.md` takes
- No changes to the root README, SUMMARY, or any generated files, so `check-docs.yml` and the TOC scripts are unaffected

**Phase 2, if the track works out:** I'm happy to add Hindi support to `generate_toc.py` and the site plumbing so translations actually render on eunomia.dev - I'd treat that as a separate, code-focused PR.

About me: final-year student at DTU (India), CNCF/LFX mentorship background (Headlamp, built the Agones Headlamp plugin to its alpha release), currently contributing across the eBPF ecosystem (inspektor-gadget, ebpf-docs). I want to build a Hindi on-ramp for eBPF and keep the translations maintained as lessons evolve.

If this sounds good, I'll open the first PR within a couple of days.