[fr] app & email
[fr] reorganize all files to follow en version

still english parts to translate
Fix broken/missing links.
Reduce heading levels.

This removes the tutorials from the TOC which is nice as they are
inlined elsewhere.
Populate the topics page.

It should have some stuff.
Make the dropdown wider.

It looked stupid before.
[fr] follow en toc evolutions
Merge pull request #1775 from cakephp/3.0-fr-follow-toc

[fr] follow en toc evolutions
Merge pull request #1776 from cakephp/3.0-fr-review-core-utility-libs

3.0 fr review core utility libs
replace vendor/bin/ by bin/
Merge pull request #1778 from cakephp/3.0-bin-moved

replace vendor/bin/ by bin/
[pt] [3.0] Update index.rst

Review of text and removal of unecessary words.
Merge pull request #1780 from andtxr/patch-1

[pt] [3.0] Update index.rst
Merge pull request #1774 from cakephp/topics-list

Populate the topics page.
[fr] follow #1774
Add docs for getting a component's controller.
[3.0] [en] Update intro.rst

Correcting var name mistake.
Merge pull request #1785 from andtxr/patch-3

[3.0] [en] Update intro.rst
[fr] follow #1785
add french translation