Update Bundling & Minification doc (#4891)
* Update Bundling & Minification doc
* Import JS code snippets
* Fix build errors
* Remove redundant text
* Swap section ordering
* Change heading text
* Add VS output from run of Gulp tasks
* More edits
* Fix bundle options text
* Dedent .NET Core CLI tab's code snippets
* Add ad-hoc run section
* Verbiage tweak
* Remove obsolete screenshots
* Verbiage tweaks
* Minor edit
* Add note
* More edits
* Simplify VS instructions
* Eliminate unnecessary sentence
* Clarify restore step
* Add missing word
* Add manual Gulp conversion section
* Fix gulpfile.js import line numbers
* Shorten sentence
* Update bundling-and-minification.md
* Update screenshot to conform to MVC art standards
* Remove unnecessary sample apps
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