Avoid using hardcoded `vscode-resource` in the URIs when referencing scripts or images

Those URIs work fine for electron, but don’t work properly when the VS Code is running in the browser.
We also faced some issues related to `vscode-resource` and CSP when tried to run the extension in Che-Theia
To ensure that the extension will work in any environment, it’s necessary to:

use the Webview.asWebviewUri function for loading resources
use the Webview.cspSource property in content security policies

Those APIs shipped around a year ago so should be available in modern versions of VS Code .

The additional information about the change could be found here https://github.com/microsoft/vscode/issues/97962
The release notes with the description of those APIs https://code.visualstudio.com/updates/v1_38#_webviewaswebviewuri-and-webviewcspsource

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