Update 4.5.-Coding-Audio-and-Video.md

Author: ccbogel

docs/doc/en/4.5.-Coding-Audio-and-Video.md

@@ -82,21 +82,7 @@ Some operating systems do not work well with audio and video in QualCoder. One e
 
 You do need to have a current 64-bit version of VLC installed, as QualCoder looks for this and uses VLC for audio and video display.
 
-#  Categories and codes
+# Categories and Codes
 
-Categories are used to organise codes. Categories are organised hierarchically in a tree structure. You can move codes into categories and move categories into larger categories. You can move categories and codes out of their current position. Codes and categories can be merged by dropping a code onto a code or a category onto a category. Categories and codes can be assigned to memos. Right-click on a category or code to rename. Right-click on a code to change the colour.
+See [Categories and Codes](https://qualcoder.org/doc/en/4.7.-Codes-Tree/)
 
-To reduce the number of codes shown in the code tree. In the coding windows (code text, code, a/v or code image), right-click on the code tree and select Show codes like from the menu. Then enter text in the text box. This will then only show codes that contain that text. Enter nothing into the text box and press OK to show all codes again.
-
-In the code tree on the left, right-clicking on a code opens a context menu for various options.
-One option is Show coded files - this shows everywhere you have coded with the selected code. Clicking on a particular coded section will open that code in the original context for further insight.
-
-With show coded files, you can right-click on the coloured header section for more options such as adding more codes, removing the code, and exporting the entire set of coded segments to a text file.
-
-![image](https://github.com/user-attachments/assets/7f0d079d-c0a8-4966-87bd-a6723f541d8d)
-
-## Accessibility and code colours
-
-In the Coding menu there is an option called **Colour scheme**.
-
-You can apply a range of colours to a range of selected codes, rather than rely on the randomly generated colours or a one-at-a-time change of colours for each code. In this area you can also view how the code colours may appear to someone who has a variety of colour blindness: red-weak, red blind, green-weak or green blind.