ckeditor readme build steps update

lib/ckeditor/dimagi-README.md

@@ -1,36 +1,49 @@
-How to recreate
-=====
+## About
+
+We are using a custom build of CK Editor 4 with the plugins mentioned [here](#ck-editor-online-build). There are two ways to create this build:
+- **Use CK Editor online builder** - This is the recommended option **if no patches are required**. Note that recreating the build this way automatically downloads the latest version of CK Editor.
+- **Build from source** - Use this procedure when building with patches that are not yet included in the main line.
+
+> NOTE: **There is one required patch that is not yet addressed in the upstream repo. Hence at present the build is being created from source.**
+
+PR for patch: https://github.com/ckeditor/ckeditor4/pull/304
+
+## CK Editor Online Build
 
 Go to the [CK build editor](http://ckeditor.com/builder).
 
-Use the following plugins:
+### Use the following plugins:
 * clipboard (for drag and drop)
 * entities
 * undo (for change events)
 * widget
+* dialog (required by clipboard)
 * [config helper](http://ckeditor.com/addon/confighelper) (for placeholder support)
 
-If by chance this hasn't been updated you can also check build-config.js in
-lib/ckeditor/
+Alternatively, you can also refer [build-config.js](/lib/ckeditor/build-config.js) to directly download/open the same setup in CKEditor online builder.
 
 
 ## Building from source
 
-Use this procedure when building with patches that are not yet included in the
-main line. Feel free to use more recent version numbers if that makes sense.
-
-- clone https://github.com/millerdev/ckeditor-dev and `cd` into ckeditor-dev
-- checkout *vellum-build* branch
-- download the minimalist skin (v1.0) and unzip/place it in the ./skins
+The repo [dimagi/ckeditor-dev](https://github.com/dimagi/) which is fork of upstream repo is used for creating a build from source using the branch **vellum-build**.
+Follow the below steps:
+- Clone the repo and checkout the **vellum-build** branch.
+- In case of **updating to the new released version** of CK Editor or any patches, merge the changes on this branch.
+  You can add the upstream repo locally using 
+  `git remote add upstream https://github.com/ckeditor/ckeditor4.git`
+- Download the minimalist skin (v1.0) and unzip/place it in the ./skins
+  directory.
+- Download confighelper plugin (v1.10.1) and unzip/place it in the ./plugins
   directory.
-- download confighelper plugin (v1.8.3) and unzip/place it in the ./plugins
-  directory
-- copy vellum/lib/ckeditor/build-config.js into ./dev/builder
-- build: ./dev/builder/build.sh --no-tar
-- move vellum/lib/ckeditor/ out of the way
-- unzip ./dev/builder/release/ckeditor_dev.zip into vellum/lib/ckeditor/
-- copy files from old vellum/lib/ckeditor/ into new unzipped dir:
+- Copy the file **vellum/lib/ckeditor/build-config.js** into **./dev/builder**
+- Run the command from root directory:  
+  ```./dev/builder/build.sh --no-tar```
+- Move **vellum/lib/ckeditor/** out of the way.
+- Unzip .**/dev/builder/release/ckeditor_dev.zip** into **vellum/lib/ckeditor/**
+- Copy below files from old **vellum/lib/ckeditor/** into new unzipped dir:
   - dimagi-README.md
   - build-config.js
-- delete extra plugins from vellum/lib/ckeditor/plugins
-- delete extra skins from vellum/lib/ckeditor/skins
+- Delete extra plugins from **vellum/lib/ckeditor/plugins**.
+- Delete extra skins from **vellum/lib/ckeditor/skins**.
+
+> NOTE: Feel free to use more recent versions of minimalist skin and confighelper plugin if that makes sense.