docs: Prepare for new website launch (#2149)

* Changed database implementation. Removed static objects.

* Fix Logs

* Fix 40 errors from checkstyle plugin run. 139 left))

* Fix CacheStore errors from checkstyle plugin 107 left

* Fix last errors in checkstyle.

* Fix sonar issues

* Fix issues in VALIDATE phase

* Fix Bug with mongo connection. Used "Try with resources"

* Add test

* Added docker-compose for mongo db. MongoDb db work fixed.

* Provided missing tests

* Comments to start Application with mongo.

* Fix some broken links

* Remove extra space

* Update filename

* Fix some links in localization folders

* Fix link

* Update frontmatters

* Work on patterns index page

* Work on index page

* Fixes according PR comments. Mainly Readme edits.

* fix frontmatter

* add missing png

* Update pattern index.md

* Add index.md for Chinese translation

* update image paths

* update circuit breaker image paths

* Update image paths for localizations

* add generated puml

* Add missing image

* Update img file extensions

* Update the rest of the EN and ZH patterns to conform with the new website

Co-authored-by: Victor Zalevskii <zvictormail@gmail.com>

localization/ko/adapter/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Adapter
-folder: adapter
-permalink: /patterns/adapter/ko
-categories: Structural
+category: Structural
 language: ko
 tags:
 - Gang of Four
@@ -96,7 +93,7 @@ captain.row();
 
 ## 클레스 다이어그램
 
-![alt text](https://github.com/warp125/java-design-patterns/blob/master/adapter/etc/adapter.urm.png?raw=true)
+![alt text](etc/adapter.urm.png)
 
 ## 적용 가능성
 

localization/ko/factory/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Factory
-folder: factory
-permalink: /patterns/factory/ko
-categories: Creational
+category: Creational
 language: ko
 tags:
 - Gang of Four
@@ -107,7 +104,7 @@ This Ferrari.
 
 ## 클래스 다이어그램
 
-![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/factory/etc/factory.urm.png)
+![alt text](etc/factory.urm.png)
 
 ## 적용 가능성
 

localization/ko/observer/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Observer
-folder: observer
-permalink: /patterns/observer/ko
-categories: Behavioral
+category: Behavioral
 language: ko
 tags:
 - Gang Of Four
@@ -137,7 +134,7 @@ The hobbits are facing sunny weather now
 
 ## 클래스 다이어그램
 
-![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/observer/etc/observer.png)
+![alt text](etc/observer.png)
 
 ## 적용 가능성
 

localization/ko/prototype/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Prototype
-folder: prototype
-permalink: /patterns/prototype/ko
-categories: Creational
+category: Creational
 language: ko
 tags:
 - Gang Of Four
@@ -67,7 +64,7 @@ System.out.println(cloned.getName()); // Dolly
 
 ## 클래스 다이어그램
 
-![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/prototype/etc/prototype.urm.png)
+![alt text](etc/prototype.urm.png)
 
 ## 적용 가능성
 

localization/ko/singleton/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Singleton
-folder: singleton
-permalink: /patterns/singleton/ko
-categories: Creational
+category: Creational
 language: ko
 tags:
 - Gang of Four
@@ -49,7 +46,7 @@ assertEquals(enumIvoryTower1, enumIvoryTower2); // true
 
 ## 클래스 다이어그램
 
-![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/singleton/etc/singleton.urm.png)
+![alt text](etc/singleton.urm.png)
 
 ## 적용 가능성
 

localization/ko/strategy/README.md

@@ -1,9 +1,6 @@
 ---
-layout: pattern
 title: Strategy
-folder: strategy
-permalink: /patterns/strategy/ko
-categories: Behavioral
+category: Behavioral
 language: ko
 tags:
  - Gang of Four
@@ -163,7 +160,7 @@ public class LambdaStrategy {
 
 ## 클래스 다이어그램
 
-![alt text](../../../strategy/etc/strategy_urm.png "Strategy")
+![alt text](etc/strategy_urm.png "Strategy")
 
 ## 적용 가능성