Revert "Add copy-pastable build instructions"

This reverts commit 03a95ef.

Sorry, you're not wrong, but I want to keep this repo as simple as
possible which means not summarizing in this manner.

Author: andrewrk

README.md

@@ -37,15 +37,6 @@ For other versions, check the git tags of this repository.
 
 ## Build Instructions
 
-TL;DR:
-
-```
-CMAKE_GENERATOR=Ninja ./build native-linux-gnu baseline
-./out/zig-x86_64-linux-gnu-baseline/zig version
-```
-
-### UNIX Build Instructions
-
 ```
 ./build <arch>-<os>-<abi> <mcpu>
 ```
@@ -70,7 +61,7 @@ significantly affect how long it takes to build:
 
 When it succeeds, output can be found in `out/zig-<triple>-<cpu>/`.
 
-### Windows Build Instructions
+## Windows Build Instructions
 
 Bootstrapping on Windows with MSVC is also possible via `build.bat`, which
 takes the same arguments as `build` above.