Removed core trees link to all translations

translations/README-ar.md

@@ -746,7 +746,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-cn.md

@@ -504,7 +504,6 @@
 ## 树（Trees）
 
 - ### 树 —— 笔记 & 背景
-    - [ ] [系列：基本树（视频）](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [系列：树（视频）](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - 基本的树形结构
     - 遍历

translations/README-de.md

@@ -727,7 +727,6 @@ Schreib Code auf einer Tafel oder auf Papier, aber nicht am Computer. Teste mit
 <summary>Trees (Bäume)</summary>
 
 - ### Trees - Notizen und Hintergrund
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - generell Baumerstellung
     - Traversieren (Durchlaufen)

translations/README-es.md

@@ -664,7 +664,6 @@ Escriba código en un pizarrón o en papel no en la computadora. Pruebe con algu
 
 ## Árboles
 - ### Árboles - Notas & Antecedentes
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - Construcción básica de árboles
     - Recorrido

translations/README-fr.md

@@ -732,7 +732,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-he.md

@@ -726,7 +726,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-hi.md

@@ -577,7 +577,6 @@ memory" का एरर न दे, और तब मुझे कोई वै
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (विडियो)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (विडियो)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-id.md

@@ -698,7 +698,6 @@ Menulis kode pada papan tulis atau kertas, bukan komputer. Uji dengan beberapa s
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-ko.md

@@ -656,7 +656,6 @@ Anki format의 내 flashcard 데이터베이스: https://ankiweb.net/shared/info
 ## 트리
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - 트리 기초 형태 만들기
     - 순회

translations/README-pl.md

@@ -644,7 +644,6 @@ Napisz kod na tablicy lub papierze, a nie na komputerze. Testuj z niektórymi pr
 ## Drzewa
 
 - ### Drzewa - uwagi & zarys
-    - [ ] [Series: Core Trees (wideo)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (wideo)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - podstawy budowy drzewa
     - traversal (ścieżki)

translations/README-ptbr.md

@@ -679,7 +679,6 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
 ## Árvores
 
 - ### Árvores - Anotações e Fundamentos
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees) (Série: Fundamentos de Árvores - vídeo)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees) (Série: Árvores - vídeo)
     - contrução básica de árvore
     - transversal

translations/README-th.md

@@ -657,7 +657,6 @@ There are a lot of distractions that can take up valuable time. Focus and concen
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-tw.md

@@ -624,7 +624,6 @@
 ## 樹狀結構(Tree)
 
 - ### Trees-重點與背景知識
-    - [ ] [Series: Core Trees (影片)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (影片)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - 如何建立一棵樹
     - 遍歷

translations/README-uk.md

@@ -655,7 +655,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 ## Trees
 
 - ### Trees - Notes & Background
-    - [ ] [Series: Core Trees (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Series: Trees (video)](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - basic tree construction
     - traversal

translations/README-vi.md

@@ -692,7 +692,6 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
 ## Cây
 
 - ### Cây - Ghi chú và kiến thức nền
-    - [ ] [Chuỗi bài giảng: Căn bản về cây](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/ovovP/core-trees)
     - [ ] [Chuỗi bài giảng: Cây](https://www.coursera.org/learn/data-structures/lecture/95qda/trees)
     - Xây dựng cây cơ bản.
     - Duyệt cây.