[Suggestion] Change readme download hyperlink

[Splarkszter]

Change download link on README from:
https://github.com/nspire-emus/firebird/releases/latest

To:
https://github.com/nspire-emus/firebird/wiki/Installing-firebird

Reasoning:
Less confusion over it and also releases do not include linux builds.

Also, the linux builds page should be improved to be more readable and easy to use.

[Vogtinator]

The wiki page has as first sentence

All the download links will be on the releases page. This should always have the latest binaries.

So I don't see how this is an improvement?

[complanar]

I guess it is meant the other way round. Point to the wiki from the repository readme to make things more clear. At the moment one has to search the wiki to find relevant information. A hint where to find information could really be useful imho.