Modifications to release process. Closes #14
As described in #14 (closed), there are some modifications to improve the release process. Due to technical difficulties with weekly builds, I've done only the alpha and stable channels. These channels have their corresponding jobs configured already in the CI settings. From now, all commits made to master, unless skipped with [skip CI], will generate a new alpha version, which will be offered to users in an update right after the runner will be done with its job. Stable versions will be deployed every time there will be a tag.