Updated installation instructions

[TheKrangled]

The only installation instructions are in a very outdated GIF that doesn't visually reflect what Blender currently looks like. It's also completely useless for anyone that happens to have a visual impairment. I wrote some new ones and knocked out a few supporting images. It's a simple enough process I don't think anyone new to the Blender interface will have an issue following along.

Clean Install

Please use the following link to download the latest release - [blender_niftools_addon-v0.1.1-2023-11-03-0305c8d5.zip](https://github.com/niftools/blender_niftools_addon/releases/download/v0.1.1/blender_niftools_addon-v0.1.1-2023-11-03-0305c8d5.zip)

Go to Edit > Preferences.

Click Add-ons in the left column.
In the top right corner of the add-ons list will be a drop down menu indicator. Click this.

Click Install from Disk.
In the file browser, select the .zip file and click Install from Disk.