docs: quirky README with Bongbetic branding, drop internal plan from remote

- Rewrite README in a playful, plain-English voice and add Bongbetic
  wordmarks/glyph/icons so Gitea renders the brand nicely (light/dark).
- Vendor assets/bongbetic-brand/* from /mnt/Toto/Documents/bongbetic/Logo.
- Remove plan-dash-changes.md from tracking (internal only) and gitignore it.

assets/bongbetic-brand/b_glyph.svg

@@ -0,0 +1,40 @@
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