mod(structure): update project structure

Remove examples, add description for design goals in README.md and
apply re-names and naming changes accordingly for the project structure.
Implement a flat hierachry, as the library shall remain pretty simple.

src/render.zig

@@ -106,7 +106,7 @@ pub fn Buffered(comptime fullscreen: bool) type {
                     if (cs.eql(cvs))
                         continue;
                     // render differences found in virtual screen
-                    // TODO: improve the writing speed (many unecessary writes (i.e. the style for every character..))
+                    // TODO: improve the writing speed (many unnecessary writes (i.e. the style for every character..))
                     try terminal.setCursorPosition(.{ .row = @truncate(row), .col = @truncate(col) });
                     try cvs.value(writer);
                     // update screen to be the virtual screen for the next frame