Add missing style CSS file

Update build instructions in README

README.md

@@ -57,10 +57,11 @@ With that disclaimer out of the way...
 4. Build Zephyr application
 
         export SOURCE_ROOT_DIR=$(pwd)
-        cd zephyr
+        cd zephyr-rtos
         mkdir build
-        ZEPHYR_BASE=${SOURCE_ROOT_DIR}/zephyr ZEPHYR_TOOLCHAIN_VARIANT=host cmake -DZEPHYR_MODULES="${SOURCE_ROOT_DIR}/littlefs;${SOURCE_ROOT_DIR}/mbedtls;${SOURCE_ROOT_DIR}/civetweb" -DBOARD=litex_kestrel ${SOURCE_ROOT_DIR}/zephyr-firmware
-        cp -Rp ../libsoft-fp.a zephyr/
+        cd build
+        ZEPHYR_BASE=${SOURCE_ROOT_DIR}/zephyr-rtos ZEPHYR_TOOLCHAIN_VARIANT=host cmake -DZEPHYR_MODULES="${SOURCE_ROOT_DIR}/littlefs;${SOURCE_ROOT_DIR}/mbedtls;${SOURCE_ROOT_DIR}/civetweb" -DBOARD=litex_kestrel ${SOURCE_ROOT_DIR}/zephyr-firmware
+        cp -Rp ../../libsoft-fp.a zephyr/
         make -j144
 
     Output is in zephyr/zephyr.bin

embeddedfiles/style.css

+body {
+	font-family: Arial;
+	margin: 0;
+}
+
+.header {
+	text-align: center;
+	background: #85b5e6;
+	color: white;
+	font-size: 30px;
+	height: 100px;
+	width: 100%;
+	line-height: 100px;
+	position: fixed;
+}
+
+.sidebar_nav {
+	height: 100%;
+	width: 160px;
+	top: 0px;
+	left: 0;
+	background-color: #ccd7e6;
+	overflow-x: hidden;
+	padding-top: 120px;
+	position: fixed;
+}
+
+.sidebar_nav a {
+	padding: 6px 8px 6px 16px;
+	text-decoration: none;
+	font-size: 25px;
+	color: black;
+	display: block;
+}
+
+.sidebar_nav a:hover {
+	color: #808080;
+}
+
+.footer {
+	position: fixed;
+	left: 160px;
+	bottom: 0;
+	width: 100%;
+	background-color: white;
+}
+
+.footer_text {
+	color: #000000;
+	font-size: 12px;
+}
+
+.main {
+	margin-left: 160px; /* Same as the width of the sidebar */
+	padding: 100px 10px;
+}
\ No newline at end of file