Add v4 migration docs (#78)

Signed-off-by: nscuro <nscuro@protonmail.com>

Author: nscuro

.vale/styles/config/vocabularies/DependencyTrack/accept.txt

@@ -13,17 +13,20 @@ Bento
 CPEs
 CWEs
 Cognito
+CSAF
 CycloneDX
 DEKs
 DNs
 Dependency-Track
 Diataxis
+EPSS
 ETags?
 Entra
 Exploitability
 Fedora 389 Directory Server
 Flashpoint
 GUIDs
+UUIDs?
 GitLab
 HDDs
 Hackage
@@ -39,6 +42,7 @@ LDAP
 LDAPS
 Liquibase
 Lucene
+MSSQL
 Mattermost
 MkDocs
 Modus
@@ -52,6 +56,7 @@ OneLogin
 OpenID Connect
 Operandi
 PGTune
+PURLs?
 Packagist
 Percona
 PgBouncer
@@ -77,11 +82,14 @@ Webex
 [Bb]ackpressure
 [Bb]locklists?
 [Bb]ooleans
+[Cc]lasspath
 [Cc]onfigs?
 [Cc]ron
 [Cc]rontab
 [Dd]atacenter
 [Dd]atasources?
+[Dd]edup
+[Dd]eduped
 [Dd]eduplicat(e[ds]?|ing)
 [Dd]eduplication
 [Dd]efault[Mm]ode
@@ -98,7 +106,9 @@ Webex
 [Ll]iveness
 [Ll]ookups
 [Ll]oopback
+[Ll]ossy
 [Mm]icroservices
+[Mm]igrators?
 [Mm]isconfiguration
 [Mm]isconfigured
 [Mm]ixeway
@@ -108,7 +118,9 @@ Webex
 [Pp]luggable
 [Pp]oolers?
 [Pp]roxied
+[Rr]eachability
 [Rr]eadiness
+[Rr]esumability
 [Rr]ethrow
 [Rr]etryable
 [Rr]ollouts

…tion/migrating-from-v4/bento-api-key.png …-v4-and-v5-in-parallel/bento-api-key.pngdocs/assets/images/guides/administration/migrating-from-v4/bento-api-key.png renamed to docs/assets/images/guides/administration/running-v4-and-v5-in-parallel/bento-api-key.png docs/assets/images/guides/administration/migrating-from-v4/bento-api-key.png renamed to docs/assets/images/guides/administration/running-v4-and-v5-in-parallel/bento-api-key.png

@@ -7,6 +7,8 @@ points lived: the runtime, the policy engine, and the operational model.
 
 This page summarises *what changed and why*. For step-by-step upgrade
 instructions, see the [upgrade guides](../guides/upgrading/index.md).
+To move data from an existing v4 deployment into v5, see
+[Migrating from v4 to v5](../guides/administration/migrating-from-v4.md).
 
 ## Why v5
 

…on/migrating-from-v4/configure-alert.png …4-and-v5-in-parallel/configure-alert.pngdocs/assets/images/guides/administration/migrating-from-v4/configure-alert.png renamed to docs/assets/images/guides/administration/running-v4-and-v5-in-parallel/configure-alert.png docs/assets/images/guides/administration/migrating-from-v4/configure-alert.png renamed to docs/assets/images/guides/administration/running-v4-and-v5-in-parallel/configure-alert.png

@@ -15,3 +15,4 @@ nav:
   - backing-up.md
   - upgrading-instances.md
   - migrating-from-v4.md
+  - running-v4-and-v5-in-parallel.md