Add examples and expand README for release

examples/NestedLayouts/README.md

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+# Nested Layouts
+
+Demonstrates nested templates, conditional placeholders, and iterator-driven sections without a web server dependency. Ideal for learning how DFTE composes complex layouts on memory-constrained boards.
+
+Highlights:
+- Shared header/footer partials referenced via `%HEADER%` and `%FOOTER%`
+- Conditional placeholder toggling a "maintenance" banner
+- Iterator rendering a list of subsystem status entries with per-item overrides
+
+## Build
+
+```
+pio run -d examples/NestedLayouts -e example_esp8266
+pio run -d examples/NestedLayouts -e example_esp32
+```
+
+Open the serial monitor at 115200 baud to inspect the rendered output.
+