docs: remove the Reference Project — nobody wants to be sent to GitHub

The "One project, open end to end" section on Examples was four cards linking into
a GitHub folder. A reader on the docs site does not want to leave for a repo tree
to read a BRIEF.md. The section is gone, and so is the examples/docs-reference-project
folder it pointed at.

Also removed the prose references that leaned on it: the Reference Project
paragraph on Go further, the two GitHub-inspect links on Developers, and the
mention on the Studio landing. Each was reworded to talk about "a project"
generally rather than that specific folder.

Examples is now purely the nineteen finished films plus Start from a template.
The changelog entry recording #2977 is left as history. 0 broken links.

Author: ukimsanov

docs/developers/index.mdx

@@ -28,8 +28,7 @@ cd my-video
 npx hyperframes preview
 ```
 
-The project is ordinary HTML. The Reference Project used in the beginner path
-starts with this real composition root:
+The project is ordinary HTML. A composition starts with this root:
 
 ```html
 <div
@@ -48,8 +47,6 @@ starts with this real composition root:
 
 The project template supplies the composition root, viewport, and duration.
 HTML and CSS control what appears; `data-*` attributes control when it appears.
-You can [inspect the complete project](https://github.com/heygen-com/hyperframes/tree/main/examples/docs-reference-project)
-before choosing an integration surface.
 When the project is ready:
 
 ```bash

docs/examples.mdx

@@ -113,32 +113,6 @@ A PR, a Figma file, a design brief — turned into a finished film.
   </a>
 </div>
 
-## One project, open end to end
-
-This is the same small project used in the Quickstart. Its request, brief,
-source, revision notes, checks, and final render are all public.
-
-```text
-Using /hyperframes, make a 10-second product intro for https://example.com.
-```
-
-<CardGroup cols={2}>
-  <Card title="Brief" icon="clipboard-list" href="https://github.com/heygen-com/hyperframes/blob/main/examples/docs-reference-project/BRIEF.md">
-    What the agent decided before building anything.
-  </Card>
-  <Card title="Source" icon="folder-open" href="https://github.com/heygen-com/hyperframes/tree/main/examples/docs-reference-project">
-    Every editable project file, exactly as it renders.
-  </Card>
-  <Card title="Revision" icon="pen-to-square" href="https://github.com/heygen-com/hyperframes/blob/main/examples/docs-reference-project/VERIFICATION.md#2-v1--v2">
-    What changed between the first and second cut, and why.
-  </Card>
-  <Card title="Checks" icon="circle-check" href="https://github.com/heygen-com/hyperframes/blob/main/examples/docs-reference-project/VERIFICATION.md">
-    The real gate output: lint, check, contrast, and the final render.
-  </Card>
-</CardGroup>
-
-The result is not a sealed demo. Open any stage above and use the same shape for
-your own project: request → brief → source → revision → render.
 
 ## Start from a template
 

docs/go-further.mdx

@@ -18,11 +18,6 @@ import { DocsVideo } from "/snippets/docs-video.jsx";
 The project does not change format as you gain control. Your agent, Studio, the
 SDK, the Player, and the renderer all work from the same HTML project.
 
-The [Reference Project](https://github.com/heygen-com/hyperframes/tree/main/examples/docs-reference-project)
-continues the first-video example. Its first version is a real page capture on a
-10-second timeline. The revised version keeps that source and adds editable
-variables, narration, fixed captions, music, and sound.
-
 ## Choose by the size of the change
 
 Use the agent for changes to the story or several scenes. Use Studio for the

docs/studio/index.mdx

@@ -15,8 +15,7 @@ import { DocsVideo } from "/snippets/docs-video.jsx";
 </div>
 
 Studio is the visual editor for the same HTML project your agent and the CLI
-use. The Reference Project from the first-video guide opens here without an
-import or conversion. Open any project folder, then run:
+use. Any HyperFrames project opens here without an import or conversion. Open any project folder, then run:
 
 ```bash
 npx hyperframes preview