fix: reformat build prereqs in readme (#290)

## Description:
Was setting up the pre-reqs to build Kurtosis locally to test a #219 but
noticed the formatting was off and hard to consume. This PR makes those
instructions easier to read and follow.

## Is this change user facing?
YES
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<!-- If yes, don't forget to include docs changes where relevant -->

## References (if applicable):
<!-- Add relevant Github Issues, Discord threads, or other helpful
information. -->

README.md

@@ -159,7 +159,7 @@ This repository is structured as a monorepo, containing the following projects:
 
 To build Kurtosis, you must the following dependencies installed:
 
-- Bash (5 or above) + Git
+#### Bash (5 or above) + Git
 
 On MacOS:
 ```bash
@@ -172,28 +172,28 @@ chsh -s "${BREW_PREFIX}/bin/bash"
 # Install modern version of git, the one that ships on MacOS is too old
 brew install git
 ```
-- Docker
+#### Docker
 
 On MacOS:
 ```bash
 brew install docker
 ```
 
-- Go (1.18 or above)
+#### Go (1.18 or above)
 
 On MacOS:
 ```bash
 brew install go@1.18
 ```
 
-- Goreleaser
+#### Goreleaser
 
 On MacOS:
 ```bash
 brew install goreleaser/tap/goreleaser
 ```
 
-- Node (16.14 or above) and Yarn
+#### Node (16.14 or above) and Yarn
 
 On MacOS, using `NVM`:
 ```bash
@@ -202,7 +202,7 @@ mkdir ~/.nvm
 nvm install 16.14.0
 npm install -g yarn
 ```
-- Go and Typescript protobuf compiler binaries
+#### Go and Typescript protobuf compiler binaries
 
 On MacOS:
 ```bash
@@ -212,7 +212,7 @@ brew install protoc-gen-grpc-web
 npm install -g ts-protoc-gen
 npm install -g grpc-tools
 ```
-- Musl
+#### Musl
 
 On MacOS:
 ```bash