Adding info about CouchDB (#6111)

* Add info about CouchDB

* Update mongodb top posts typo

* adjust content style

* adjust content style

* Update src/data/roadmaps/backend/content/mongodb@28U6q_X-NTYf7OSKHjoWH.md

---------

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/backend/content/couchdb@qOlNzZ7U8LhIGukb67n7U.md

@@ -1 +1,11 @@
-# CouchDB
+# CouchDB
+
+Apache CouchDB is an open-source document-oriented NoSQL database. It uses JSON to store data, JavaScript as its query language using MapReduce, and HTTP for an API. Unlike a relational database, a CouchDB database does not store data and relationships in tables. Instead, each database is a collection of independent documents. Each document maintains its own data and self-contained schema.
+
+Visit the following resources to learn more:
+
+- [@article@CouchDB Website](https://couchdb.apache.org/)
+- [@article@CouchDB Documentation](https://docs.couchdb.org/)
+- [@article@The big NoSQL databases comparison](https://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis/)
+- [@article@pouchdb - a JavaScript database inspired by CouchDB](https://pouchdb.com/)
+- [@feed@Explore top posts about CouchDB](https://app.daily.dev/tags/couchdb?ref=roadmapsh)

src/data/roadmaps/backend/content/mongodb@28U6q_X-NTYf7OSKHjoWH.md

@@ -1,6 +1,4 @@
-# Document databases
-
-## MongoDB
+# MongoDB
 
 MongoDB is a source-available cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL).
 
@@ -13,4 +11,3 @@ Visit the following resources to learn more:
 - [@article@Learning Path for MongoDB Developers](https://learn.mongodb.com/catalog)
 - [@article@Dynamo DB Docs](https://docs.aws.amazon.com/dynamodb/index.html)
 - [@article@Official Developers Guide](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Introduction.html)
-- [@feed@Explore top posts about Backend Development](https://app.daily.dev/tags/backend?ref=roadmapsh)