docs: comprehensive documentation updates and modernization

- Update BUILDING.md with current build system information
- Modernize various README files across the project
- Update CHANGELOG.md with recent changes
- Improve documentation consistency and formatting
- Update platform-specific documentation (iOS, Electron, Docker)
- Enhance test documentation and build guides

doc/README.md

@@ -6,7 +6,7 @@ This uses Pandoc and BasicTex (LaTeX) Installed through Homebrew.
 
 ### Set Up
 
-```bash 
+```bash
 brew install pandoc
 
 brew install basictex
@@ -54,7 +54,7 @@ sudo tlmgr install sourceserifpro
 
 The following guide was adapted to this project except that we install with Brew and have a few more packages.
 
-Guide: https://daniel.feldroy.com/posts/setting-up-latex-on-mac-os-x
+Guide: <https://daniel.feldroy.com/posts/setting-up-latex-on-mac-os-x>
 
 ### Usage
 
@@ -71,6 +71,7 @@ open usage-guide.pdf
 ```
 
 Or use this one-liner
+
 ```bash
 pandoc usage-guide.md -o usage-guide.pdf && open usage-guide.pdf
 ```