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

CHANGELOG.md

@@ -6,69 +6,88 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [1.0.7] - 2025.08.18
+
 ### Fixed
+
 - Deep link for onboard-meeting-members
 
-
 ## [1.0.6] - 2025.08.09
+
 ### Fixed
+
 - Deep link errors where none would validate
 
-
 ## [1.0.5] - 2025.07.24
+
 ### Fixed
+
 - Export & import of contacts corrupted contact methods
 
-
 ## [1.0.4] - 2025.07.20 - 002f2407208d56cc59c0aa7c880535ae4cbace8b
+
 ### Fixed
+
 - Deep link for invite-one-accept
 
-
 ## [1.0.3] - 2025.07.12 - a9a8ba217cd6015321911e98e6843e988dc2c4ae
+
 ### Changed
+
 - Photo is pinned to profile mode
+
 ### Fixed
+
 - Deep link URLs (and other prod settings)
 - Error in BVC begin view
 
-
 ## [1.0.2] - 2025.06.20 - 276e0a741bc327de3380c4e508cccb7fee58c06d
+
 ### Added
+
 - Version on feed title
 
-
 ## [1.0.1] - 2025.06.20
+
 ### Added
+
 - Allow a user to block someone else's content from view
 
-
 ## [1.0.0] - 2025.06.20 - 5aa693de6337e5dbb278bfddc6bd39094bc14f73
+
 ### Added
+
 - Web-oriented migration from IndexedDB to SQLite
 
-
 ## [0.5.8]
+
 ### Added
+
 - /deep-link/ path for URLs that are shared with people
+
 ### Changed
+
 - External links now go to /deep-link/...
 - Feed visuals now have arrow imagery from giver to receiver
 
-
 ## [0.4.7]
+
 ### Fixed
+
 - Cameras everywhere
+
 ### Changed
+
 - IndexedDB -> SQLite
 
-
 ## [0.4.5] - 2025.02.23
-### Added
-- Total amounts of gives on project page
-### Changed in DB or environment
-- Requires Endorser.ch version 4.2.6+
 
+### Added
+
+- Total amounts of gives on project page
+
+### Changed in DB or environment
+
+- Requires Endorser.ch version 4.2.6+
 
 ## [0.4.4] - 2025.02.17