Low hanging fruit (mmistakes#2186)

* Update 05-configuration.md

- fix dead Twitter Dev docs url
- slight clarification re: Player Card approval
- fix Jekyll docs url

* Update 2013-01-10-markup-image-alignment.md

- fix the/re typo

docs/_docs/05-configuration.md

@@ -677,7 +677,7 @@ twitter:
 
 And if I assign `@mmistakes` as an author account it will appear in the Twitter Card along with `@mmistakes-theme`, attributed as a creator of the page being shared.
 
-**Note**: You need to [apply for Twitter Cards](https://dev.twitter.com/docs/cards) and validate they're working on your site before they will begin showing up.
+**Note**: You need to validate cards are working and have Twitter [approve Player Cards](https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/player-card) before they will begin showing up.
 {: .notice--warning}
 
 ##### Facebook Open Graph
@@ -855,7 +855,7 @@ Again nothing out of the ordinary here as the theme adheres to the defaults used
 
 ## Front Matter Defaults
 
-To save yourself time setting [Front Matter Defaults](https://jekyllrb.com/docs/configuration/#front-matter-defaults) for posts, pages, and collections is the way to go. Sure you can assign layouts and toggle settings like **reading time**, **comments**, and **social sharing** in each file, but that's not ideal.
+To save yourself time setting [Front Matter Defaults](https://jekyllrb.com/docs/configuration/front-matter-defaults/) for posts, pages, and collections is the way to go. Sure you can assign layouts and toggle settings like **reading time**, **comments**, and **social sharing** in each file, but that's not ideal.
 
 Using the `default` key in `_config.yml` you could set the layout and enable author profiles, reading time, comments, social sharing, and related posts for all posts --- in one shot.
 

docs/_posts/2013-01-10-markup-image-alignment.md

@@ -19,7 +19,7 @@ The image above happens to be **centered**.
 
 ![image-left]({{ site.url }}{{ site.baseurl }}/assets/images/image-alignment-150x150.jpg){: .align-left} The rest of this paragraph is filler for the sake of seeing the text wrap around the 150×150 image, which is **left aligned**.
 
-As you can see the should be some space above, below, and to the right of the image. The text should not be creeping on the image. Creeping is just not right. Images need breathing room too. Let them speak like you words. Let them do their jobs without any hassle from the text. In about one more sentence here, we'll see that the text moves from the right of the image down below the image in seamless transition. Again, letting the do it's thing. Mission accomplished!
+As you can see there should be some space above, below, and to the right of the image. The text should not be creeping on the image. Creeping is just not right. Images need breathing room too. Let them speak like you words. Let them do their jobs without any hassle from the text. In about one more sentence here, we'll see that the text moves from the right of the image down below the image in seamless transition. Again, letting the do it's thing. Mission accomplished!
 
 And now for a **massively large image**. It also has **no alignment**.
 
@@ -49,7 +49,7 @@ The figure above happens to be **centered**. The caption also has a link in it,
 
 The rest of this paragraph is filler for the sake of seeing the text wrap around the 150×150 image, which is **left aligned**.
 
-As you can see the should be some space above, below, and to the right of the image. The text should not be creeping on the image. Creeping is just not right. Images need breathing room too. Let them speak like you words. Let them do their jobs without any hassle from the text. In about one more sentence here, we'll see that the text moves from the right of the image down below the image in seamless transition. Again, letting the do it's thing. Mission accomplished!
+As you can see there should be some space above, below, and to the right of the image. The text should not be creeping on the image. Creeping is just not right. Images need breathing room too. Let them speak like you words. Let them do their jobs without any hassle from the text. In about one more sentence here, we'll see that the text moves from the right of the image down below the image in seamless transition. Again, letting the do it's thing. Mission accomplished!
 
 And now for a **massively large image**. It also has **no alignment**.