Updates to README for branch name and local preview

Author: agentlecisco

README.md

@@ -2,13 +2,13 @@
 
 These self-paced interactive tutorials provide an introduction to coding.
 
-Labs are written to be displayed within the [Cisco DevNet Learning Labs system](https://learninglabs.cisco.com).
+Labs are written to be displayed within the [Cisco DevNet Learning Labs system](https://developer.cisco.com/learning).
 
 Contributions are welcome, and we are glad to review changes through pull requests. See [contributing.md](contributing.md) for details.
 
 Once approved, Cisco DevNet reviewers then create a release that is published through our Learning Labs system.
 
-The goal of these learning labs is to ensure a 'hands-on' learning approach rather than just theory or instructions.
+The goal of these Learning Labs is to ensure a 'hands-on' learning approach rather than just theory or instructions.
 
 ## About these Learning Labs
 
@@ -18,19 +18,7 @@ If you need more help, reach out to DevNet through one of our [support options](
 
 ## Preview Learning Lab Markdown locally
 
-You can preview how the Markdown renders by using a pre-built Docker image. The `Makefile` in the root of the repository lets you run `make preview` to view the output HTML.
-
-1. Make sure you have Docker installed locally. If not, [install Docker](https://docs.docker.com/install/) for your operating system.
-```
-$ docker -v
-```
-1. In the root of the repository, run:
-```
-$ make preview
-```
-1. Open a browser window with the URL: `http://localhost:9000`.
-1. Click a folder to find the Markdown file you want to preview.
-1. When you are done previewing, type `Ctrl+C` to stop running the Docker container.
+Refer to the instruction for your text editor for Markdown previewing. For example, [Markdown and Visual Studio Code](https://code.visualstudio.com/Docs/languages/markdown) describes how to configure Markdown extensions. 
 
 ## Contributing
 
@@ -45,9 +33,9 @@ To create and publish a new lab, take the following steps:
 - Create a JSON file with the same name as the `labs/`_folder_ name.
 - Create markdown files named 1.md, 2.md, and so on; refer to those files in the `labs/`_folder_ JSON file.
 - Ensure that the JSON file contains appropriate page titles and file references.
-- Send a pull request to get the files committed and merged to `master` by a DevNet reviewer.
+- Send a pull request to get the files committed and merged to the default branch by a DevNet reviewer.
 
-A DevNet reviewer then creates a release on the repository with the latest `master` and publishes through the admin interface.
+A DevNet reviewer then creates a release on the repository with the latest changes and publishes through the admin interface.
 
 #### Editors