Restore gg8.se links (#616)

* Update HuC3.md

* Update MBC6.md

* Update MBC7.md

Author: nitro2k01

src/HuC3.md

@@ -163,4 +163,4 @@ Location | Purpose
 
 ## External links
 
-- Source: [GBDev Forums thread](https://web.archive.org/web/20231003224822/https://gbdev.gg8.se/forums/viewtopic.php?id=744)
+- Source: [GBDev Forums thread](https://gbdev.gg8.se/forums/viewtopic.php?id=744)

src/MBC6.md

@@ -171,7 +171,7 @@ Write Enable bit to 1, then issue the Unprotect Sector 0 flash command.
 
 ## External links
 
-- Source: [GBDev Forums thread by endrift](https://web.archive.org/web/20241204030511/https://gbdev.gg8.se/forums/viewtopic.php?id=544)
+- Source: [GBDev Forums thread by endrift](https://gbdev.gg8.se/forums/viewtopic.php?id=544)
 - Reference: [Nintendo Power Game Boy Memory cartridge documentation](https://iceboy.a-singer.de/doc/np_gb_memory.html)
   * The NP GB Memory cartridges use a nearly identical flash chip.
     It seemingly only slightly differs in its part number. Therefore,

src/MBC7.md

@@ -141,5 +141,5 @@ enable section as well (0000-1FFF)
 
 ## External links
 
-- Source: [GBDev Forums thread by endrift](https://web.archive.org/web/20250424080817/https://gbdev.gg8.se/forums/viewtopic.php?id=448)
+- Source: [GBDev Forums thread by endrift](https://gbdev.gg8.se/forums/viewtopic.php?id=448)