Replace center tag

Replace `<center>` tag

Author: santaimpersonator

docs/github/file_issue.md

@@ -4,9 +4,9 @@
 !!! warning "Need Help?"
 	If you need technical assistance or more information on a product that is not working as you expected, we recommend heading on over to the [SparkFun Technical Assistance](https://www.sparkfun.com/technical_assistance) page for some initial troubleshooting. This **Submit Issues** page is not where users should seek assistance.
 
-	<center>
+	<article style="text-align: center;" markdown>
 	[SparkFun Technical Assistance Page](https://www.sparkfun.com/technical_assistance){ .md-button .md-button--primary }
-	</center>
+	</article>
 
 	If you can't find what you need there, the [SparkFun Forums](https://forum.sparkfun.com) is a great place to search the product forums and ask questions.
 

docs/system_overview.md

@@ -57,15 +57,15 @@ Below are two generic examples of a GNSS Flex *module* and *carrier* board.
 
 
 ???+ tip "Manipulate 3D Model"
-	<center>
+	<article style="text-align: center;" markdown>
 
 	| Controls       | Mouse                    | Touchscreen    |
 	| :------------- | :----------------------: | :------------: |
 	| Zoom           | Scroll Wheel             | 2-Finger Pinch |
 	| Rotate         | ++"Left-Click"++ & Drag  | 1-Finger Drag  |
 	| Move/Translate | ++"Right-Click"++ & Drag | 2-Finger Drag  |
 
-	</center>
+	</article>
 
 
 

docs/troubleshooting_tips.md

@@ -1,9 +1,9 @@
 !!! warning "Need Help?"
 	If you need technical assistance or more information on a product that is not working as you expected, we recommend heading over to the [SparkFun Technical Assistance](https://www.sparkfun.com/technical_assistance) page for some initial troubleshooting.
 
-	<center>
+	<article style="text-align: center;" markdown>
 	[SparkFun Technical Assistance Page](https://www.sparkfun.com/technical_assistance){ .md-button .md-button--primary }
-	</center>
+	</article>
 
 	If you can't find what you need there, the [SparkFun Forums](https://forum.sparkfun.com/index.php) is a great place to search product forums and ask questions.
 
@@ -13,6 +13,6 @@
 
 
 <!-- QR Code for Hookup Guide (Displayed when printed) -->
-<center>
+<article style="text-align: center;" markdown>
 ![QR code to the hookup guide](./assets/img/qr_code/hookup_guide.png){ .qr }
-</center>
+</article>