Fedora Developer Portal - update

[Adam Samalik]

I have just updated the Fedora Developer Portal with the following content.
Big thanks to everyone who contributed!

What's new:

- Eclipse
  https://developer.fedoraproject.org/tools/eclipse/about.html
  by Alexander Kurtakov

- Maintain and Improve
  https://developer.fedoraproject.org/deployment/maintain/about.html
  by Petr Hracek

- Secondary Architectures

https://developer.fedoraproject.org/deployment/secondary_architectures/about...
  by Sinny Kumari

- Jekyll
  https://developer.fedoraproject.org/start/sw/web-app/jekyll.html
  by Jakub Kadlcik

- Laravel 5
  https://developer.fedoraproject.org/start/sw/web-app/laravel5.html
  by nat-

- GTK+
  https://developer.fedoraproject.org/tech/languages/c/gtk.html
  by Felipe Borges

- PyGObject
  https://developer.fedoraproject.org/tech/languages/python/pygobject.html
  by Felipe Borges

- PHP SIG
  https://developer.fedoraproject.org/tech/languages/php/php-sig.html
  by Neal Gompa

Updated pages:

- Docker
  https://developer.fedoraproject.org/tools/docker/about.html
  by Jiri Popelka