chore(docs): improves URL macros in README.md (#3022)

Author: pranshuchittora

README.md

@@ -1,61 +1,56 @@
 # webpack.js.org
 
-[![Build Status][13]][10]
-[![Standard Version][12]][11]
+[![Build Status][build-status]][build-status-url]
+[![Standard Version][release]][release-url]
 
 Guides, documentation, and all things webpack.
 
-
 ## Content Progress
 
 Now that we've covered much of the backlog of _missing documentation_, we are
 starting to heavily review each section of the site's content to sort and
 structure it appropriately. The following issues should provide a pretty good
 idea of where things are, and where they are going:
 
-- [Guides - Review and Simplify][1]
-- [Concepts - Review and Organize][2]
-- [API - v4 Rewrite][8]
+- [Guides - Review and Simplify][guides-url]
+- [Concepts - Review and Organize][concepts-url]
+- [API - v4 Rewrite][api-url]
 
 We haven't created issues for the other sections yet, but they will be coming
-soon. For dev-related work please see [General - Updates & Fixes][3].
-
+soon. For dev-related work please see [General - Updates & Fixes][general-url].
 
 ## Translation
 
-To help translate this documentation please jump to the [translate branch][4].
-
+To help translate this documentation please jump to the [translate branch][translate-url].
 
 ## Contributing
 
-Read through the [writer's guide][7] if you're interested in editing the
-content on this site. See the [contributors page][5] to learn how to set up and
+Read through the [writer's guide][writer-guide-url] if you're interested in editing the
+content on this site. See the [contributors page][contributing-url] to learn how to set up and
 start working on the site locally.
 
-
 ## License
 
-The content is available under the [Creative Commons BY 4.0][6] license.
-
+The content is available under the [Creative Commons BY 4.0][license-url] license.
 
 ## Special Thanks
 
 _BrowserStack_ has graciously allowed us to do cross-browser and cross-os
 testing of the site at no cost...
 
-[![BrowserStackLogo](./browserstack-logo.png)][9]
-
-
-[1]: https://github.com/webpack/webpack.js.org/issues/1258
-[2]: https://github.com/webpack/webpack.js.org/issues/1386
-[3]: https://github.com/webpack/webpack.js.org/issues/1525
-[4]: https://github.com/webpack/webpack.js.org/tree/translation
-[5]: https://github.com/webpack/webpack.js.org/blob/master/.github/CONTRIBUTING.md
-[6]: https://creativecommons.org/licenses/by/4.0/
-[7]: https://webpack.js.org/writers-guide
-[8]: https://github.com/webpack/webpack.js.org/pull/1754
-[9]: http://browserstack.com/
-[10]: http://travis-ci.org/webpack/webpack.js.org
-[11]: https://github.com/conventional-changelog/standard-version
-[12]: https://img.shields.io/badge/release-standard%20version-brightgreen.svg
-[13]: https://secure.travis-ci.org/webpack/webpack.js.org.svg
+[![BrowserStackLogo][browserstack]][browserstack-url]
+
+[api-url]: https://github.com/webpack/webpack.js.org/pull/1754
+[build-status]: https://secure.travis-ci.org/webpack/webpack.js.org.svg
+[build-status-url]: http://travis-ci.org/webpack/webpack.js.org
+[browserstack]: ./browserstack-logo.png
+[browserstack-url]: http://browserstack.com/
+[concepts-url]: https://github.com/webpack/webpack.js.org/issues/1386
+[contributing-url]: https://github.com/webpack/webpack.js.org/blob/master/.github/CONTRIBUTING.md
+[general-url]: https://github.com/webpack/webpack.js.org/issues/1525
+[guides-url]: https://github.com/webpack/webpack.js.org/issues/1258
+[license-url]: https://creativecommons.org/licenses/by/4.0/
+[release]: https://img.shields.io/badge/release-standard%20version-brightgreen.svg
+[release-url]: https://github.com/conventional-changelog/standard-version
+[translate-url]: https://github.com/webpack/webpack.js.org/tree/translation
+[writer-guide-url]: https://webpack.js.org/writers-guide