chore: update README

Mostly sentence case for headers and adding new info as needed + removing older things

Diffs=
e68c7b6de chore: update README (#6824)

Co-authored-by: Gordon <[email protected]>

.rive_head

@@ -1 +1 @@
-bcf6451f442d7d55ed423982b58204e93c1d8791
+e68c7b6ded17c667fe344426e54710875fc58e94

README.md

@@ -16,7 +16,7 @@ The C++ runtime for Rive provides these runtime features:
 - Abstract Renderer for submitting high level vector path commands with retained path objects to optimize and minimize path re-computation (ultimately up to the concrete rendering implementation).
 - Example concrete renderer written in C++ with [Skia](https://skia.org/). Skia renderer code is in [skia/renderer/src/skia_factory.cpp](skia/renderer/src/skia_factory.cpp).
 
-## Build System
+## Build system
 We use [premake5](https://premake.github.io/). The Rive dev team primarily works on MacOS. There is some work done by the community to also support Windows and Linux. PRs welcomed for specific platforms you wish to support! We encourage you to use premake as it's highly extensible and configurable for a variety of platforms.
 
 ## Build
@@ -52,10 +52,10 @@ The tests live in ```rive/test```. To add new tests, create a new ```xxx_test.cp
 
 There's a VSCode command provided to ```run tests``` from the Tasks: Run Task command palette. 
 
-## Code Formatting
+## Code formatting
 rive-cpp uses clang-format, you can install it with brew on MacOS: ```brew install clang-format```.
 
-## Memory Checks
+## Memory checks
 Note that if you're on MacOS you'll want to install valgrind, which is somewhat complicated these days. This is the easiest solution (please PR a better one when it becomes available).
 
 ```
@@ -65,7 +65,7 @@ brew install --HEAD LouisBrunner/valgrind/valgrind
 
 You can now run the all the tests through valgrind by running ```test.sh memory```.
 
-## Disassembly Explorer
+## Disassembly explorer
 If you want to examine the generated assembly code per cpp file, install [Disassembly Explorer](https://marketplace.visualstudio.com/items?itemName=dseight.disasexpl) in VSCode.
 
 A ```disassemble``` task is provided to compile and preview the generated assembly. You can reach it via the Tasks: Run Task command palette or you can bind it to a shortcut by editing your VSCode keybindings.json: