Fix some broken links

Author: timholy

docs/src/function_reference.md

@@ -208,7 +208,7 @@ fastcorners
 
 ### Feature Extraction
 
-See the [ImageFeatures]() package for a much more comprehensive set of tools.
+See the [ImageFeatures](https://juliaimages.org/ImageFeatures.jl/stable/) package for a much more comprehensive set of tools.
 
 ```@docs
 blob_LoG

docs/src/imagefeatures.md

@@ -7,7 +7,7 @@ descriptors in other images or other portions of the same image. This
 can be useful in many applications, such as object recognition,
 localization, or image registration.
 
-ImagesFeatures has [its own documentation](http://juliaimages.github.io/ImageFeatures.jl/latest/index.html), and you should consult that for a comprehensive overview of the functionality of the package. Here, we'll briefly illustrate one type of feature and its application to image registration, the *BRISK* descriptor.
+ImagesFeatures has [its own documentation](https://juliaimages.org/ImageFeatures.jl/stable), and you should consult that for a comprehensive overview of the functionality of the package. Here, we'll briefly illustrate one type of feature and its application to image registration, the *BRISK* descriptor.
 
 The *BRISK* descriptor examines the structure of an image around a
 *keypoint*. Given a keypoint, the mean intensity (loosely-speaking) is

docs/src/quickstart.md

@@ -301,7 +301,7 @@ location across multiple images. More information can be found in
 
 ## Examples of usage
 
-If you feel ready to get started, see the [Demonstrations](@ref) page for inspiration.
+If you feel ready to get started, see the [Demonstrations](@ref demonstrations) page for inspiration.
 
 ## Function categories