Remove outdated Projects chapters

_sidebar.md

@@ -35,13 +35,6 @@
    * [Chapter Owners](/chapter_owners.md)
    * [Access to (Dutch) e-Infrastructure](/nlesc_specific/e-infrastructure/e-infrastructure.md)
       * [DAS-5](/nlesc_specific/e-infrastructure/das5.md)
-   * [Projects](/nlesc_specific/projects/project_overview.md)
-      * [new Project()](/nlesc_specific/projects/new_project.md)
-      * [Kickoff Meeting](/nlesc_specific/projects/kickoff_meeting.md)
-      * [Project Planning](/nlesc_specific/projects/project_planning.md)
-      * [Project Reviews](/nlesc_specific/projects/project_reviews.md)
-      * [Communication](/nlesc_specific/projects/communication.md)
-      * [End of a Project](/nlesc_specific/projects/end_of_a_project.md)
    * [Checklist](/nlesc_specific/checklist.md)
       * [Development stages matrix](/nlesc_specific/checklist_matrix.md)
       * [Prototype phase](/nlesc_specific/checklist/checklist_prototype.md)