Modify photo placeholder (default.svg) for bright and dark modes;

Update document README.

README.md

@@ -12,7 +12,7 @@ other services.
 
 ### Reasons for creating FASI
 
-The main reasons for the realization of FASI are:
+The main reasons for the realization of FASI are to:
 
 - Add interactive capabilities, as well as vCard information;
 - Create rapport with the viewers, by displaying vCard information, such as Full
@@ -26,6 +26,8 @@ The main reasons for the realization of FASI are:
 - Realize that HTTP is obsolete and should be treated as an optional publishing
   mean, because anything that HTTP offers, is already possible with XMPP, since
   a couple of decades ago.
+- Extend support for Gopher and Gemini, which do not allow scripts, and,
+  therefore, a server-side is essential for these ASCII type mediums.
 
 ### Special features
 
@@ -36,14 +38,16 @@ The main reasons for the realization of FASI are:
 - View journal articles (i.e. PubSub node items that are published as Atom Over
   XMPP).
 
-### Byproduct
+### Unintended features
 
 - Browse services;
 - Explore JID and node items.
 
 ### Other features
 
-- Customization for specific brands (e.g. monocles chat);
+- Customization for specific brands (e.g. Conversations, Cheogram, monocles chat
+  and yaxim);
+- Dark mode;
 - Dynamic background in accordance to the photo colors.
 
 ## Technicalities
@@ -88,8 +92,10 @@ Schimon Jehudah Zachary 2024
 
 ## Thanks
 
-A special thank you for Mr. Georg Lukas who has exposed the HTML invitation page
-to the founder of this project.
+A special thank you for Mr. Georg Lukas of [op-co.de](https://op-co.de/) from
+Germany, who has gracefully published a sophisticated client-side HTML
+invitation page, and consequently exposed that idea to the founder of this
+project.
 
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