Document file system object content addressing

In addition:

- Take the opportunity to add a bunch more missing hyperlinks, too.

- Remove some glossary entries that are now subsumed by dedicated pages.
  We used to not be able to do this without breaking link fragments, but
  now we can, so pick up where we left off.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>

doc/manual/src/command-ref/nix-store/dump.md

@@ -1,6 +1,6 @@
 # Name
 
-`nix-store --dump` - write a single path to a Nix Archive
+`nix-store --dump` - write a single path to a [Nix Archive]
 
 ## Synopsis
 
@@ -8,7 +8,7 @@
 
 ## Description
 
-The operation `--dump` produces a NAR (Nix ARchive) file containing the
+The operation `--dump` produces a [NAR (Nix ARchive)][Nix Archive] file containing the
 contents of the file system tree rooted at *path*. The archive is
 written to standard output.
 
@@ -33,6 +33,8 @@ but not other types of files (such as device nodes).
 A Nix archive can be unpacked using `nix-store
 --restore`.
 
+[Nix Archive]: @docroot@/store/file-system-object/content-address.md#serial-nix-archive
+
 {{#include ./opt-common.md}}
 
 {{#include ../opt-common.md}}