Standardize working examples

[fstrr]

Closes #4978

1. All pages have HTML5 doctype
2. Added viewport tag with the same attribute values as the WCAG 2 site
3. Added CSS body tag styling so the font is the same on each page
4. Standardized the charset tag
5. Removed old attrs on the html element
6. Removed unneeded attrs on script and style tags
7. Fixed a couple of reflow bugs
8. Fixed an issue with an input not having an accessible name
9. Removed some deprecated HTML attrs on some table elements

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[patrickhlauke]

Discussed in TF meeting today. Small changes (TODO @kfranqueiro):

• back out the one change to scripting / removing jQuery (meant for Remove jQuery from Techniques #4981)
• change ": WCAG 2" to "| WCAG 2"

Otherwise good to go, moving to ready for approval

[patrickhlauke]

Discussed in TF meeting today. Small changes (TODO @kfranqueiro):

• back out the one change to scripting / removing jQuery (meant for Remove jQuery from Techniques #4981)
• change ": WCAG 2" to "| WCAG 2"

Otherwise good to go, moving to ready for approval

Heads-up @kfranqueiro @fstrr ... done both these changes just now