use doxygen as github pages in docs/

tests/t-demo.cpp

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+#include <iostream>
+
+#include "../clutchlog/clutchlog.h"
+
+void i()
+{
+    CLUTCHLOG(progress, "Reset data structures...");
+    CLUTCHLOG(debug, "OK");
+    CLUTCHLOG(progress, "Reset functors...");
+    CLUTCHLOG(critical, "Impossible to reset, I cannot recover.");
+}
+
+void h()
+{
+    CLUTCHLOG(note, "Filling up data of size: " << 0);
+    CLUTCHLOG(error, "Cannot parse input, I will reset stuff.");
+    i();
+    CLUTCHLOG(xdebug, "Last seen state: " << 0);
+}
+
+void g()
+{
+    CLUTCHLOG(warning, "Input size < " << 1);
+    h();
+}
+
+void f()
+{
+    CLUTCHLOG(progress, "Initialize data structures...");
+    CLUTCHLOG(debug, "OK");
+    CLUTCHLOG(progress, "Initialize functors...");
+    CLUTCHLOG(debug, "OK");
+    g();
+}
+
+int main(const int argc, char* argv[])
+{
+    auto& log = clutchlog::logger();
+
+    log.out(std::clog);
+    log.depth_mark("\t");
+    log.format("[{name}] {level}: {depth_marks} {msg}\n");
+    log.style(clutchlog::level::progress,clutchlog::fmt::fg::blue);
+    log.threshold(clutchlog::level::warning);
+
+    if(argc <= 2) {
+        CLUTCHLOG(warning, "Log level not indicated, will default to xdebug");
+        log.threshold(clutchlog::level::xdebug);
+    } else {
+        try {
+            log.threshold(log.level_of(argv[1]));
+        } catch(std::out_of_range err) {
+            CLUTCHLOG(critical,err.what());
+            exit(100);
+        }
+    }
+
+    CLUTCHLOG(progress,"Start something");
+    f();
+    CLUTCHLOG(progress,"I have stopped");
+}