doc: minor, adjust image syntax and headings

- Consistent formatting of image formatting
 - Make container examples easier to see

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

doc/container.md

@@ -1,7 +1,7 @@
-Containers in Infix
-===================
+Docker Container Support
+========================
 
-![Docker whale](img/docker.webp){ width=360 align="right" }
+![Docker whale](img/docker.webp){ align=right width="360" }
 
 Infix comes with native support for Docker containers using [podman][].
 The [YANG model][1] describes the current level of support, complete
@@ -86,10 +86,9 @@ your container image and application to run.
 > support the CPU architecture of your host system.  Remember, unlike
 > virtualization, containers reuse the host's CPU and kernel.
 
+![Hello World](img/docker-hello-world.svg){ align=right width="200" }
 
-![Hello World](img/docker-hello-world.svg){align="right" width="360"}
-
-### Examples
+### Example: Hello World
 
 Classic Hello World:
 
@@ -105,6 +104,8 @@ Classic Hello World:
     Hello from Docker!
     This message shows that your installation appears to be working correctly.
 
+### Example: Web Server
+
 A web server with [nginx][], using standard docker bridge.  Podman will
 automatically create a VETH pair for us, connecting the container to the
 `docker0` bridge:
@@ -255,7 +256,7 @@ archive, which helps greatly with container upgrades (see below):
 
 Upgrading a Container Image
 ---------------------------
-![Up-to-date Shield](img/shield-checkmark.svg){align="right" width="100"}
+![Up-to-date Shield](img/shield-checkmark.svg){ align=right width="100" }
 
 The applications in your container are an active part of the system as a
 whole, so make it a routine to keep your container images up-to-date!

doc/index.md

@@ -1,4 +1,4 @@
-![Infix - Linux <3 NETCONF](logo.png){ width=480 align=right }
+![Infix - Linux <3 NETCONF](logo.png){ align=right  width="480" }
 
 Welcome to Infix, your immutable, friendly, and secure operating system!
 On these pages you can find both user and developer documentation.