#59 Implement update functionality for companies

[parsival2022]

Implemented update functionality for companies. It's some kind of mini-blog or personal page in social media that allows startup companies to present themselves to potential investors and shering their ideas and growth.

• Database scheme created and implemented;
• ArticleManager that operates with database created;
• MongoManager improved;
• Views for articles retrieving, deleting, creating and redacting created;

[KuzykY]

In my opinion everything is great)A lot of work has been done!)