readme: add link to docs page

README.md

@@ -45,6 +45,8 @@ against it.
 
 ## Usage
 
+[Documentation](https://rockorager.github.io/libvaxis/#vaxis.Vaxis)
+
 The below example can be run using `zig build run 2>log`. stderr must be
 redirected in order to not print to the same screen.
 

build.zig

@@ -74,7 +74,7 @@ pub fn build(b: *std.Build) void {
     // Docs
     const docs = b.addStaticLibrary(.{
         .name = "vaxis",
-        .root_source_file = .{ .path = "src/main.zig" },
+        .root_source_file = root_source_file,
         .target = target,
         .optimize = optimize,
     });