Updated more links to forum.opencv.org

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,5 @@
 <!--
-If you have a question rather than reporting a bug please go to http://answers.opencv.org where you get much faster responses.
+If you have a question rather than reporting a bug please go to https://forum.opencv.org where you get much faster responses.
 If you need further assistance please read [How To Contribute](https://github.com/opencv/opencv/wiki/How_to_contribute).
 
 This is a template helping you to create an issue which can be processed as quickly as possible. This is the bug reporting section for the OpenCV library.
@@ -27,4 +27,4 @@ This is a template helping you to create an issue which can be processed as quic
     // C++ code example
     ```
  or attach as .txt or .zip file
--->
+-->

doc/py_tutorials/py_setup/py_intro/py_intro.markdown

@@ -83,4 +83,4 @@ Additional Resources
 2.  [NumPy Quickstart tutorial](https://numpy.org/devdocs/user/quickstart.html)
 3.  [NumPy Reference](https://numpy.org/devdocs/reference/index.html#reference)
 4.  [OpenCV Documentation](http://docs.opencv.org/)
-5.  [OpenCV Forum](http://answers.opencv.org/questions/)
+5.  [OpenCV Forum](https://forum.opencv.org/)

doc/tutorials/introduction/android_binary_package/O4A_SDK.markdown

@@ -21,7 +21,7 @@ If you need help with anything of the above, you may refer to our @ref tutorial_
 
 If you encounter any error after thoroughly following these steps, feel free to contact us via
 [OpenCV4Android](https://groups.google.com/group/android-opencv/) discussion group or OpenCV [Q&A
-forum](http://answers.opencv.org). We'll do our best to help you out.
+forum](https://forum.opencv.org). We'll do our best to help you out.
 
 Tegra Android Development Pack users
 ------------------------------------

doc/tutorials/introduction/android_binary_package/android_dev_intro.markdown

@@ -11,7 +11,7 @@ working environment quickly. It was written with Windows 7 in mind, though it wo
 
 If you encounter any error after thoroughly following these steps, feel free to contact us via
 [OpenCV4Android](https://groups.google.com/group/android-opencv/) discussion group or OpenCV [Q&A
-forum](http://answers.opencv.org). We'll do our best to help you out.
+forum](https://forum.opencv.org). We'll do our best to help you out.
 
 Preface
 -------

doc/tutorials/introduction/android_binary_package/dev_with_OCV_on_Android.markdown

@@ -25,7 +25,7 @@ may consult our @ref tutorial_O4A_SDK tutorial.
 
 If you encounter any error after thoroughly following these steps, feel free to contact us via
 [OpenCV4Android](https://groups.google.com/group/android-opencv/) discussion group or OpenCV [Q&A
-forum](http://answers.opencv.org) . We'll do our best to help you out.
+forum](https://forum.opencv.org) . We'll do our best to help you out.
 
 Using OpenCV Library Within Your Android Project
 ------------------------------------------------

doc/tutorials/introduction/windows_install/windows_install.markdown

@@ -7,7 +7,7 @@ Installation in Windows {#tutorial_windows_install}
 
 The description here was tested on Windows 7 SP1. Nevertheless, it should also work on any other
 relatively modern version of Windows OS. If you encounter errors after following the steps described
-below, feel free to contact us via our [OpenCV Q&A forum](http://answers.opencv.org). We'll do our
+below, feel free to contact us via our [OpenCV Q&A forum](https://forum.opencv.org). We'll do our
 best to help you out.
 
 @note To use the OpenCV library you have two options: @ref tutorial_windows_install_prebuilt or
@@ -345,7 +345,7 @@ libraries). If you do not need the support for some of these, you can just freel
 
     To test your build just go into the `Build/bin/Debug` or `Build/bin/Release` directory and start
     a couple of applications like the *contours.exe*. If they run, you are done. Otherwise,
-    something definitely went awfully wrong. In this case you should contact us at our [Q&A forum](http://answers.opencv.org/).
+    something definitely went awfully wrong. In this case you should contact us at our [Q&A forum](https://forum.opencv.org/).
     If everything is okay, the *contours.exe* output should resemble the following image (if
     built with Qt support):
 

modules/videoio/src/cap_libv4l.cpp

@@ -14,9 +14,6 @@ It has been tested with the motempl sample program
 First Patch:  August 24, 2004 Travis Wood   TravisOCV@tkwood.com
 For Release:  OpenCV-Linux Beta4  opencv-0.9.6
 Tested On:    LMLBT44 with 8 video inputs
-Problems?     Post your questions at answers.opencv.org,
-              Report bugs at code.opencv.org,
-              Submit your fixes at https://github.com/opencv/opencv/
 Patched Comments:
 
 TW: The cv cam utils that came with the initial release of OpenCV for LINUX Beta4

modules/videoio/src/cap_v4l.cpp

@@ -14,9 +14,6 @@ It has been tested with the motempl sample program
 First Patch:  August 24, 2004 Travis Wood   TravisOCV@tkwood.com
 For Release:  OpenCV-Linux Beta4  opencv-0.9.6
 Tested On:    LMLBT44 with 8 video inputs
-Problems?     Post your questions at answers.opencv.org,
-              Report bugs at code.opencv.org,
-              Submit your fixes at https://github.com/opencv/opencv/
 Patched Comments:
 
 TW: The cv cam utils that came with the initial release of OpenCV for LINUX Beta4

samples/cpp/stereo_calib.cpp

@@ -17,7 +17,6 @@
    OPENCV WEBSITES:
      Homepage:      http://opencv.org
      Online docs:   http://docs.opencv.org
-     Q&A forum:     http://answers.opencv.org
      GitHub:        https://github.com/opencv/opencv/
    ************************************************** */