feat: add bicep and bicepparam

[scottmckendry]

Now that I've added these filetypes to upstream vim and they have been merged into neovim, it makes sense to include them here 🙂

I've copied the colours from the official MSFT VSC*de extension:

https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/overview?tabs=bicep

Let me know if any changes are required or if there are any questions!

[gegoune]

Thanks! Please run make to generate light colours too. (see https://github.com/nvim-tree/nvim-web-devicons/blob/master/CONTRIBUTING.md#building)

[scottmckendry]

Oops! Done that now 🙂 thanks

[gegoune]

Thank you very much!