Handle new technologies field for apps

[aniri]

A new field should be added for apps:

• update scripts for apps table and add a new column for storing a list of technologies as strings
• update add and edit app calls - update the info to be saved in db when filling in the add app form to include the list of technologies
• update the response returned by all calls for retrieving the apps list or info about an app; add the info from the technologies field

Best practices

• codebase language should be English
• we 💕 unit tests

[paul-ghiran]

Need to rebase on #78

[paul-ghiran]

• update scripts for apps table and add a new column for storing a list of technologies as strings
• update add and edit app calls - update the info to be saved in db when filling in the add app form to include the list of technologies
• update the response returned by all calls for retrieving the apps list or info about an app; add the info from the technologies field