Add Uptime-Kuma introduction, write descriptive alt text site-wide, and fix brand capitalization and filenames with spaces

content/en/2.general/2.networking/1.nat.md

@@ -7,7 +7,7 @@ description: Learn how NAT, port forwarding, and DHCP work on a home router. Con
 :ellipsis{left=0px width=40rem top=10rem blur=140px zIndex=60}
 
 
-![picture](/img/global/nat.svg)
+![Diagram of NAT translating a private LAN address to a public IP address](/img/global/nat.svg)
 
 ## What is a "port"?
 

content/en/2.general/2.networking/2.dns.md

@@ -12,7 +12,7 @@ When you browse a website or use an app, requests are made to one or more domain
 
 The DNS zone is like a registry with signposts that direct your requests to the correct destination.
 
-![Picture](/img/global/dns.svg)
+![Diagram of a DNS zone directing requests to the right server](/img/global/dns.svg)
 
 ## The DNS Zone