[admin] GirlDevelopIt should be Girl Develop It

[brendajin]

Summary

• [ ] Replace all copy instances of GirlDevelopIt with Girl Develop It.
• [ ] Make sure not to replace any URLs

  Example

In teaching-materials/jquery/exercises/domaccess.html:

<li>The logos of the media sources that featured GirlDevelopIt (lifeHacker, TED, etc., at the bottom of the page)</li>

Should be

<li>The logos of the media sources that featured Girl Develop It (lifeHacker, TED, etc., at the bottom of the page)</li>

[KangboLu]

Fixed three typos in three files and the pull request is made. @AlphaZach @fauzipradipta