wiki: create pages for 1.21.9 blocks and items

Is your feature request related to a problem? Please describe.

Because the last working version of the Isometrics Renderer mod is for 1.21.4 (with mixed results using a build for 1.21.8) and the Wiki generator used the render filenames as the basis for its articles, there is no documentation for the items and blocks added for the 1.21.9 version.

Describe the solution you'd like

Create pages (even if they're stumps) for the five shelves and eight copper chandelier variants introduced in v0.3.1.

Ideally they'd have isometric renders of each block, but a clean screenshot or even a missing-texture placeholder would suffice

Describe alternatives you've considered

I'd actually be fine with just two pages:

• one for shelves
• one for copper chandeliers

These could feature larger screenshots showing all variants

Additional context

Any articles on copper chandeliers should mention the optional resource pack.

Start by reviewing the existing wiki pages and the Wiki generator, using the v0.3.1 release as the reference for the five shelves and eight copper chandelier variants. Done means pages exist for those blocks, with renders, screenshots, or placeholders, and copper chandelier articles mention the optional resource pack.