Add splash screens, and reference them on /web-configurator/community…

…-splash-screens.mdx (#8)

* Modified Dreamcast VMU art for five games

VMU art ripped via screenshot within Flycast

* Original design splash screen

Simple original splash screen created via Piskel and a generic late 80s arcade font.

* Update community-splash-screens.mdx

Added references for six images uploaded to docs/assets/images/community-splash-screens/

docs/web-configurator/community-splash-screens.mdx

@@ -16,4 +16,5 @@ All images been formatted to 128x64 in black / white color.
 | ![BentoBox](../assets/images/community-splash-screens/BentoBox.png)      | ![Crush_Counter](../assets/images/community-splash-screens/CrushCounter-v2-0.png) | ![GP2040-CE1](../assets/images/community-splash-screens/GP2040-CE-1.png)          | ![GP2040-CE2](../assets/images/community-splash-screens/GP2040-CE-2.png)        | ![GP2040-CE3](../assets/images/community-splash-screens/GP2040-CE-3.png) |
 | ------------------------------------------------------------------------ | --------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- | ------------------------------------------------------------------------ |
 | ![GP2040-CE4](../assets/images/community-splash-screens/GP2040-CE-4.png) | ![GP2040-CE5](../assets/images/community-splash-screens/GP2040-CE-5.png)          | ![Sega_Astro_City](../assets/images/community-splash-screens/Sega-Astro-City.png) | ![Street_Fighter](../assets/images/community-splash-screens/Street-Fighter.png) | ![TheTrain](../assets/images/community-splash-screens/TheTrain-Logo.png) |
-| ![GP2040-CE6](../assets/images/community-splash-screens/GP2040-CE-6.png) | ![GP2040-CE7](../assets/images/community-splash-screens/GP2040-CE-7.png)          |                                                                                   |                                                                                 |                                                                          |
+| ![GP2040-CE6](../assets/images/community-splash-screens/GP2040-CE-6.png) | ![GP2040-CE7](../assets/images/community-splash-screens/GP2040-CE-7.png)          | ![Capcom_vs_SNK_2](../assets/images/community-splash-screens/CVS2_DC.png)         | ![SF_Alpha_3](../assets/images/community-splash-screens/Alpha3_DC.png)          | ![Mrvl_vs_Capcom](../assets/images/community-splash-screens/MVC1DC.png)  |
+| ![Pls_Swd](../assets/images/community-splash-screens/PlasmaSword_DC.png) | ![Rival_Schools](../assets/images/community-splash-screens/RivalSchools_DC.png)   | ![New_Challenger](../assets/images/community-splash-screens/NewChallenger-1.png)  |                                                                                 |                                                                          |