Enable Continuous capture of Satellite images

Continuing from the work done in PR #42 , We need to automate the weekly capture of images through the creation of dedicated celery task which will run weekly.
The images downloaded should be stored in the filesystem.

Once this is done a new issue can be opened to implement the postprocessing of the images to generate the data to be inserted in the table `Clima_Satelite`. This table schema may need to be redesigned, to conform with the data available. Issue #22 has an older proposal.