Column Filter

I noticed the links throughout the paragraphs were inheriting their permission from the menu anchors, so they were not visible. I added an [anchors within paragraphs style](https://github.com/chancyk/smart-table-website/compare/gh-pages#diff-06150d4002c12ba42e67e4b33450e629R13) so those links now show up in blue. An example of this issue can be seen with the orderBy link in the first sentence of the **Sort data** section.

I also moved the customHeader.html and customFilter.js code to the **Search/filter data** example where the functional demo exists and provided [a link](https://github.com/chancyk/smart-table-website/compare/gh-pages#diff-eacf331f0ffc35d4b482f1d15a887d3bR551) to that section from the comment under the **Cell Template** section. I removed the code tabs following that comment since there was no demo with it and it would be redundant with the linked **Filter** section.