Remove Side-files Support

[ahmed-kamal2004]

👋

• According to issue Drop support for side-files #483, side-files feature is not used in Jenkins, and it results in wasting a part of time crawling the filesystem searching for index.html side-files

So I removed that snippet of code
Dispatcher d = IndexHtmlDispatcher.make(webApp.context, clazz);
if (d!=null)
dispatchers.add(d);

this removes support for web-inf/side-files/index.html pages

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• update maven-example

Justification: I tried to use jetty with it before updating, but that resulted in various problems, now anyone can run it using mvn jetty:run

example when sending request to local-instance of the example at localhost:9090/items/

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• use discover instead of 'discoverExtensions' following the TODO in the code.

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• Note: afaik jenkins now is using only (html-'jelly'-'groovy') files, there is no jsp files
  so we can't remove the facets support
  
  
  
  

some snippets showing the used extensions in jenkins, and there is no .jsp

[ahmed-kamal2004]

@timja @jglick
please review if this pull request can be merged or need adjustments, thanks

[jglick]

Superseded by #637?

[ahmed-kamal2004]

Superseded by #637?

Yes, as I am seeking a better commits history in stapler repo

[jglick]

For the record, you can just force-push to an existing pull request branch if you preferred to rebase your own commits for whatever reason.

[ahmed-kamal2004]

Thanks @jglick ⚡️ , I will consider this info in my consideration in the comming contribution 🚀
regarding #637 is there any comments on it ? or a change needed ?

[jglick]

Sorry, have not had a chance to look at it, have several hundred GitHub notifications to sort through! Others might get to it before me.