New 'Aplication' related fields

[RicardCots]

Is your feature request related to a problem? Please describe.
Two new fields are required to improve the landing page of SITMUN clients:

1. Application image: A field in which the Image URL is stored
2. Application description: A text field that contains the field of a

Image examples:
For Menorca viewer https://sitmun.org/Documents/Imatges/8480img1320220524090127.jpg
For Barcelona viewer https://sitmun.org/Documents/Imatges/8601img1320230421013907.jpg
For Spain viewer https://sitmun.org/Documents/Imatges/8606img1320230421020213.JPG

Description examples:
For Menorca viewer: ' Visualizador que sintetiza la información geográfica disponible de Menorca, con datos procedentes de varias administraciones públicas.
For Barcelona viewer: 'Recopilación de los datos publicados por la diputación de Barcelona que cumplen con la Directiva Inspire'
For Spain viewer: 'Ejemplo de visor SITMUN con datos de la administración general del Estado, organizados tanto por tema como según el anejo II de la Directiva Inspire'

Describe the solution you'd like
Two new fields added in SITMUN database and supported for the backoffice.

Describe alternatives you've considered
Not storing the image URL but the image itself in the SITMUN database?

[fjlopez]

Done!

[mvinent]

Solved in this commit.

[fjlopez]

The branch https://github.com/sitmun/sitmun-admin-app/tree/new-field is not yet merged with Updates. @mvinent you should do a PR to Updates.