[↺] Update readme.md

[fernandomema]

As development has progressed, some information has become outdated. Listed here the things that we should update and fix in the project readme:

• Built With: now, we don't heavily depend on mongodb and mongoose since now we are using canario for database abstraction.
• Usage: As experts says, it's better to use npx link instead of npm link, for compatibility reasons and less issues.
• Update roadmap.