Remove outdated builder info from docs

These are 100% wrong and misleading, so we should remove them

docs/source/builder.md

@@ -1,84 +0,0 @@
-# Creating a New Builder for jupyter-repo2docker
-
-## Overview
-
-Repo2Docker uses [s2i][] to turn a git repository into a Docker image. The
-image:
-
-- may be used with Jupyter notebooks, including via JupyterHub
-- includes the contents of the source git repo
-
-This process is handled via an [s2i][] **builder**. A builder contains two
-components:
-
-1. the **s2i builder image**, which turns GitHub repos into docker images
-2. the **BuildPack object** in `repo2docker/detectors.py`, which detects
-   which builder to use based on the source repo contents, and then invokes
-   the appropriate, matching builder image
-
-[s2i]: https://github.com/openshift/source-to-image/blob/master/docs/builder_image.md
-
-
-## Making a new s2i builder
-
-1. Choose a name for a new builder, `buildername`. Typically, the `buildername`
-   will correspond to a package manager name.
-
-   For example, let's choose `npm` as the `buildername`.
-
-2. To get started creating a builder, run the `s2i create` command. From the
-  `s2i-builders` directory, run:
-
-    ```bash
-    s2i create jupyterhub/repo2docker-{buildername} {buildername}
-
-    # Example `s2i create` command where {buildername} is npm
-    s2i create jupyterhub/repo2docker-npm npm
-    ```
-
-3. To build the image, in the newly created `s2i-builders/{buildername}`
-   directory (or `s2i-builders/npm` directory for the example), run:
-
-    ```bash
-    make
-    ```
-
-    This step creates a `Dockerfile`.
-
-## Modifying the Dockerfile
-
-You can modify your `Dockerfile` and fill out the `docker build`, as you want.
-There are two files that may be edited:
-
-1. **The `Dockerfile` for the builder itself** The `Dockerfile` is used to
-   create the base builder image (e.g. installing the base runtime environment).
-
-2. **The `s2i/bin/assemble` script** The `s2i/bin/assemble` script is run
-when creating each new image from a given repository (e.g. pulling in
-repo-specific dependencies and repo contents).
-
-You can view the existing s2i-builders in this repo for examples to reference.
-
-## Adding the BuildPack
-
-Once you builder image is finished, you need to add a Buildpack to run your
-builds and to make sure that your new builder is used on the appropriate source
-repos.
-
-1. Define your BuildPack class in `detectors.py`. In most cases, you only need
-  to implement two things if you subclass `S2IBuildPack`:
-
-  - the `detect` method to determine whether a repo should choose your
-    BuildPack
-  - setting the `build_image`  attribute, either via config or during the
-    `.detect()` method
-
-2. Finally, to get the builder application to use your BuildPack, add it to
-   the `buildpacks` list in `app.py`.
-
-3. Once everything above is done, you should be able to build a repo by
-   specifying a source repo URL with this command:
-
-   ```bash
-   python -m repo2docker https://github.com/yourname/your-repo
-   ```

docs/source/index.rst

@@ -13,6 +13,5 @@ Site Contents
    install
    usage
    design
-   builder
    faq
    samples