Add simple statistics

[tomasz-pucka]

Description

Statistics should cover at least: number of analyzed lines, number of detected smells, number of analyzed files, number of analyzed repos. They should be presented as text.
They should be shown in several places:

• Landing page - sum of: analyzed lines, detected smells, analyzed files, analyzed repos. This data should be fetched from server.
• File / uploaded code expansion panels - number of: analyzed lines, detected smells
• Files expansion panels (Code upload, Repo analysis) - number of analyzed files, sum of analyzed lines, sum of detected smells