Remove stale page ToC entries

Fixes #129 

Signed-off-by: Till Schneidereit <[email protected]>

Author: tschneidereit

content/v3/contributing-docs.md

@@ -12,9 +12,7 @@ keywords = "contribute contributing"
   - [2. How-To Guides](#2-how-to-guides)
   - [3. Reference](#3-reference)
   - [4. Explanation](#4-explanation)
-- [Documents Relevant to Two or More Projects](#documents-relevant-to-two-or-more-projects)
-- [Technical Documentation Procedure (Video)](#technical-documentation-procedure-video)
-- [Technical Documentation Procedure (Text)](#technical-documentation-procedure-text)
+- [Technical Documentation Procedure](#technical-documentation-procedure)
   - [1. Fork the Repository](#1-fork-the-repository)
   - [2. Clone the Fork](#2-clone-the-fork)
   - [3. Create New Branch](#3-create-new-branch)