Fix dead links with archive.org

[turnrye]

What

In looking around the docs, I noticed that there were 5 links to dead pages. Let's fix that.

Why

This way it's easier for people to learn about the hardware support, and the website also seems more complete.

How

In most cases, the last snapshot with the content from archive.org is being used. There is one instance where SCT3258_datasheet_v2_0.pdf is not captured by archive.org, so instead I've replaced the link with a popular website's CDN.

Old link	New link
http://members.optuszoo.com.au/jason.reilly1/868mods.htm#Inside	https://web.archive.org/web/20220831184913/https://members.optuszoo.com.au/jason.reilly1/868mods.htm
https://premier01.com/inf/?C=M;O=D	https://web.archive.org/web/20230102224956/https://premier01.com/inf/?C=M;O=D
https://www.gigadevice.com/microcontroller/gd32f303vgt6/	https://web.archive.org/web/20230202004134/https://www.gigadevice.com/microcontroller/gd32f303vgt6/
https://www.cmlmicro.com/wp-content/uploads/2018/07/SCT3258_HDK_User_Guide_V1_9.pdf	https://web.archive.org/web/20220518011541/https://cmlmicro.com/wp-content/uploads/2018/07/SCT3258_HDK_User_Guide_V1_9.pdf
https://www.cmlmicro.com/wp-content/uploads/2018/07/SCT3258_datasheet_v2_0.pdf	https://cdn.hackaday.io/files/1642237026116832/SCT3258_datasheet_v2_0.pdf

Next steps

I still need to put automated checking in for dead links. When that happens, there may be follow-up MRs to correct other areas to.

[silseva]

Thanks!