Misc Improvements (#7)

* get rid of optional<ptr> -> double indirection

* more optional cleanup

* fix

* add more render pixel type options

* towards different views

* missing virtual declaration of ShowImage

* fix runtime

* init image view factory

* fix build

Render Image close button re-enable

add readme

init documentation

use awesomeDoxygen

ci build docs

install doxygen

id token permission

add pages write permission

lib/app/DefaultApp.cpp

@@ -57,7 +57,7 @@ void pixelarium::ui::DefaultApp::RenderImages()
 
 void pixelarium::ui::DefaultApp::ImageGalleryRender()
 {
-    ImGui::SetNextWindowSize(ImVec2(300, 500));
+    ImGui::SetNextWindowSize(ImVec2(300, 550));
     ImGui::Begin(SHOWIMAGEGALLERY, &this->image_listp_);
 
     // this updates the render collection
@@ -121,7 +121,6 @@ void pixelarium::ui::DefaultApp::ImageGalleryRender()
 
 void pixelarium::ui::DefaultApp::LoadImage()
 {
-    size_t last_id{};
     auto res{pfd::open_file("Load Inputs", pfd::path::home(), {"All Files", "*"}, pfd::opt::multiselect).result()};
     for (auto& p : res)
     {