title: How do you extend article document class in LaTeX?
body: <p>I don't really need a lot of changes to the default article document class. All I want is:</p>
  
  <ul>
  <li>redefine page margins (I want them to be the same on all pages, but different from the default values);</li>
  <li>use title page;</li>
  <li>add more elements on the title page (<em>title</em>, <em>author</em> and <em>date</em> is not enough for me, I want <em>company</em> and company <em>logo</em> to be on the title page as well);</li>
  <li>change styles of the <em>sections</em>, <em>subsections</em> and <em>subsubsections</em> (I don't want the numbers to be shown, otherwise - they're good).</li>
  </ul>
  
  <p>Perhaps, there are some packages that could be helpful in this case?</p>