More file data on linker dapp

[nearnshaw]

Include the following info in the Linker Dapp, when signing to deploy a scene

• Total added size of all files in scene. This is useful because it's common for scenes to have dozens of files, so not easy to add them all up.
• Total available capacity for scene (15 MB x number of parcels). This gives the total file size context. Without this limit as a reference, that number doesn't mean much.
• Warning if this max capacity is exceeded and by how much. Seeing a warning message here is a lot more friendly than seeing it on console later. Remember that many of our users are not familiar with the console
• Warning if any individual file is larger than max limit per file (50 MB), and which file & how big it is. Same as above

Additionally, some minor changes for more clarity:

• Once the scene starts deploying, a y/n prompt appears with no instructions. It's confusing because you don't know what you're saying yes/no to. The prompt should read “Abort monitoring deployment process”
• Once the scene is deployed, rename the field Entity id to Content Version ID. This is a less confusing name to beginners, who might find the concept of entities conflicting with the entities they define in the scenes.