feat(monthlyInfo): added image field

docker-compose.yml

internal/file/file.go

internal/file/file_test.go

internal/models/monthlyInfo.go

internal/models/monthlyNews.go

internal/models/monthlyReport.go

internal/models/poll.go

internal/rootmux/rootmux.go

internal/rootmux/rootmux_test.go

template.env