Fix broken links

[FraglyG]

• CLI installation references were didn't have a / prefix
• Mongo Replica Set template's URL changed to ha-mongo

[brody192]

I wonder if the other HA template links are outdated given I did change them all to ha-* after they where made public.

[FraglyG]

I just checked and couldn't find any other broken HA template links, not sure if you fixed them since you've said that
I did find some other broken links though, I'll add them to this PR later

[FraglyG]

I took the liberty of going through all of the template links I could find (I might've missed some but I covered most of them) to make sure they're all in tact, it seems they all are!

I did notice however that some pages reference the outdated Chroma template, would it be fine if I replaced those links with my Chroma template? It's more up-to-date and maintained.

Pages referencing outdated Chroma template:

• https://docs.railway.com/reference/databases
• https://docs.railway.com/guides/build-a-database-service

I also found 11 https://railway.app references, should I convert these to https://railway.com while I'm at it too?

[brody192]

Yep you are free to replace the template with your template, and update the https://railway.app links!

[FraglyG]

Awesome! Thank you :D
I believe that should be all then

[brody192]

Thank you!