docs: update README and refactor IDE package installation

- Update README to reflect new modular setup architecture
- Document all installed packages, scripts, and post-install tasks
- Add clear instructions for supported distributions and customization

- Move Visual Studio Code installation to main package script
- Add JetBrains Rider to package installation
- Remove redundant VS Code install from Fedora .NET script
- Consolidate IDE installations in single location for better organization

scripts/01-package-install.sh

@@ -53,7 +53,9 @@ PACKAGE_LIST=($(printf "%s\n" "${PACKAGE_LIST[@]}" | LC_ALL=C sort -u))
 FLATPAK_LIST=(
     com.bitwarden.desktop
     com.github.tchx84.Flatseal
+    com.jetbrains.Rider
     com.valvesoftware.Steam
+    com.visualstudio.code
     net.davidotek.pupgui2
     net.veloren.airshipper
     org.videolan.VLC