Replace o2 with o2-new and remove o2-new

[brtbrt]

Summary

Promotes the o2-new icon set to become the canonical o2 brand and removes o2-new entirely. Figma is now synced to speak only about o2, which points at the former o2-new source.

Changes

• Icons: icons/o2 now contains the former o2-new set (947 icons across filled/regular/light); icons/o2-new removed.
• Animated icons: animated-icons/O2 now equals the former O2-new (error.json, success.json); the previous O2/old and O2/resources assets and O2-new were removed.
• Figma export config (brands.config.js): removed o2-new from BRAND_ORDER and deleted its brand object; the o2 brand now points defaultFileId at the new file CjvgrHEIycSQ6exznxnFXT.
• Workflow (figma-export.yml): dropped the o2-new choice, repointed O2_FILE_URL to the new O2 Figma file, and removed the O2_NEW_FILE_URL/O2_NEW_URL variables, the o2-new PR case, and the O2-new mention in the "all" PR body.
• package.json: removed the three export-o2-new-* scripts.
• .gitignore: removed the o2-new-*.json generated-config entries.
• Docs: regenerated README.md and ICON_TABLE.md; the O2 row now shows the promoted set with no separate O2-New entry.

Required actions before merging

Unlike the Vivo-evolution PR, this change introduces no placeholders: o2 reuses the real, existing Figma file id CjvgrHEIycSQ6exznxnFXT. There is, however, one required action:

• Update the O2_FIGMA_ID secret in the figma-import GitHub environment to CjvgrHEIycSQ6exznxnFXT (or remove it so the new defaultFileId is used). The export driver resolves the source as process.env[figmaEnv] || defaultFileId, so a stale secret pointing at the old O2 file (wHTqJ7KDhGKrNSNpmMb9nW) would silently override the new default and revert icons/o2 to the old icons on the next export.

[yceballost]

nice!