Incorrect link in doxygen documentation

The link to mathjax is not correct anymore (config.xml), the latest version points to version 3.0 and here there is no output.html either. Setting it fixed to the 2.7 version.
The other corrected links are just about redirections that are otherwise done.

Author: albert-github

doc/commands.doc

@@ -2911,7 +2911,7 @@ class Receiver
 
   \addindex \\startuml
   Starts a text fragment which should contain a valid description of a
-  PlantUML diagram. See http://plantuml.com/ for examples.
+  PlantUML diagram. See https://plantuml.com/ for examples.
   The text fragment ends with \ref cmdenduml "\\enduml".
   \note You need to install Java and the PlantUML's jar file,
   if you want to use this command. The location of the jar file should be specified

doc/faq.doc

@@ -299,7 +299,7 @@ At the time I was looking into \c lex and \c yacc, where a lot of things start w
 I once wrote a GUI widget based on the Qt library (it is still available at
 https://sourceforge.net/projects/qdbttabular/ but hasn't been updated since 2002).
 Qt had nicely generated documentation (using an internal tool which
-<a href="http://rant.gulbrandsen.priv.no/udoc/history">they didn't want to release</a>)
+<a href="https://rant.gulbrandsen.priv.no/udoc/history">they didn't want to release</a>)
 and I wrote similar docs by hand.
 This was a nightmare to maintain, so I wanted a similar tool. I looked at
 Doc++ but that just wasn't good enough (it didn't support signals and

doc/features.doc

@@ -100,7 +100,7 @@
 Although doxygen can now be used in any project written in a language that is 
 supported by doxygen, initially it was specifically designed to be used for projects 
 that make use of Qt Software's 
-<A HREF="https://www.qt.io/developers/">Qt toolkit</A>. I have tried to 
+<A HREF="https://www.qt.io/developers">Qt toolkit</A>. I have tried to 
 make doxygen `Qt-compatible'. That is: Doxygen can read the documentation contained in 
 the Qt source code and create a class browser that looks quite similar to the 
 one that is generated by Qt Software. Doxygen understands the C++ extensions 

doc/install.doc

@@ -46,7 +46,7 @@ tools should be installed.
 
 <ul>
 <li>Qt Software's GUI toolkit
-    <a href="https://www.qt.io/developers/">Qt</A>
+    <a href="https://www.qt.io/developers">Qt</A>
     \addindex Qt
     version 4.3 or higher (including Qt 5).
     This is needed to build the GUI front-end doxywizard.
@@ -211,7 +211,7 @@ nmake
 \endverbatim
 
 Note that compiling Doxywizard requires Qt 4.3 or newer
-(see https://www.qt.io/developers/).
+(see https://www.qt.io/developers).
 
 Also read the next section for additional tools you may need to install to run
 doxygen with certain features enabled.

src/config.xml

@@ -2463,7 +2463,7 @@ The \c DOCSET_PUBLISHER_NAME tag identifies the documentation publisher.
 <![CDATA[
  When MathJax is enabled you can set the default output format to be used for
  the MathJax output.
- See <a href="http://docs.mathjax.org/en/latest/output.html">the MathJax site</a>
+ See <a href="http://docs.mathjax.org/en/v2.7-latest/output.html">the MathJax site</a>
  for more details.
 ]]>
       </docs>
@@ -2502,7 +2502,7 @@ MATHJAX_EXTENSIONS     = TeX/AMSmath TeX/AMSsymbols
  The \c MATHJAX_CODEFILE tag can be used to specify a file with javascript
  pieces of code that will be used on startup of the MathJax code.
  See
-<a href="http://docs.mathjax.org/en/latest/output.html">the MathJax site</a>
+<a href="http://docs.mathjax.org/en/v2.7-latest/output.html">the MathJax site</a>
  for more details.
 ]]>
       </docs>