Remove missing icons from articles (latex4ei#79)

* remove question icon

* Revert "remove question icon"

This reverts commit b7761a5.

* Reapply "remove question icon"

This reverts commit 950c89a.

* Update math.md

* Update todo.md

* Update team.md

* Update links.md

* Update contact.md

* Update physics.md

* Update machines.md

* Update electronics.md

* Update contribution.md

* Update informatics.md

_article/_info/about.md

@@ -1,6 +1,5 @@
 ---
 title: About TeX4TUM
-icon: question
 ---
 
 

_article/_info/contact.md

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 ---
 title: Contact
-icon: user-edit
 ---
 
 # Contact Form

_article/_info/contribution.md

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 title: Contribution
-icon: edit
 ---
 
 This article describes how you can contribute or edit articles.

_article/_info/links.md

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 title: Links
-icon: file-alt
 ---
 
 ## Other Websites

_article/_info/team.md

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 title: Team
-icon: users
 ---
 
 # Our Team

_article/_info/todo.md

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 title: TODO
-icon: tasks
 ---
 
 This pages displays articles that needs improvement.

_article/electronics/electronics.md

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 title: Electronics
-icon: microchip
 ---
 
 This cateogory covers topics for practical use. The theory of [electromagnetism](electromagnetism) is covered by the physics category.

_article/informatics/informatics.md

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 title: Informatics
-icon: code
 ---
 
 Informatics is the study of computation, automation, and information. 

_article/machines/machines.md

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 title: Machines
-icon: cogs
 ---
 
  This branch will cover mechanical engineering and its applications. The theory on motion and materials are coverd in physics.

_article/math/math.md

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 title: Math
-icon: calculator
 ---
 
 {{ FOLDER_TOC }}

_article/physics/physics.md

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 title: Physics
-icon: flask
 ---
 
 Physics is a natural science and studies matter, motion, and energy.