chore(docs): override the transitive deps Dependabot cannot reach

[ManukMinasyan]

The weekly Dependabot security run for /docs has failed on every attempt since 2026-09-09 with conflicting-dependencies. esbuild, sharp and @tiptap/core are not direct dependencies: they sit behind docus and nuxt, which cap them below the patched versions. Dependabot reports "the latest possible version that can be installed is 0.25.12" and gives up, so no PR is ever opened and the advisories stay open.

docus is already at its latest (5.13.0), so an overrides block in docs/package.json is the only lever:

package	was	now	advisory
esbuild	0.25.12, 0.27.3, 0.27.7	0.28.2	>= 0.17.0 < 0.28.1
sharp	0.35.3	0.35.4	< 0.35.4
@tiptap/core	3.30.2	3.31.3	>= 3.7.0 < 3.30.5
js-yaml	4.3.1	4.3.2	>= 4.0.0 < 4.3.2

comark keeps its nested js-yaml 5.4.1, which is above the 5.x advisory range.

Verified locally: npm install reports 0 vulnerabilities, and npm run generate with the deploy workflow environment prerenders all 71 routes.

Supersedes #229 (the js-yaml bump is included here).

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