Retrieve logos from a static server

[gabaldon]

No description provided.

[Tommytrg]

To accomplish our goal of avoiding release a new version, every time we add or update a new price feed, we have to implement #153, but we also have to add images without releasing a new version. Currently, when we add a new price feed, we include the network and token SVGs in the release.

A workaround would be to upload the images to a static server and fetch the images from there. The easiest way to build this is setting up an Amazon S3, Azure Blob Storage, Google Cloud Storage or Firebase Storage

See also #154

[Tommytrg]

Finally, we have decided to upload the different logos to the Github repository and read them from there