Merge pull request #29220 from omrope79:doc_optimizations_v4

[FOLLOW UP] : Documentation optimizations for the new Sphinx structure #29220

### Pull Request Readiness Checklist

This PR serves as a follow-up to the new documentation system introduced in [#29206](https://github.com/opencv/opencv/pull/29206)
Co-authored by: @abhishek-gola @kirtijindal14 @Akansha-977 @Prasadayus @varun-jaiswal17

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

doc/header.html

@@ -18,6 +18,7 @@
   <!--END FULL_SIDEBAR-->
 <!--END DISABLE_INDEX-->
 <script type="text/javascript" src="$relpath^jquery.js"></script>
+<script type="text/javascript" src="$relpath^version.js"></script>
 <script type="text/javascript" src="$relpath^dynsections.js"></script>
 <script type="text/javascript" src="$relpath^tutorial-utils.js"></script>
 <!--BEGIN COPY_CLIPBOARD-->