Move docs into subdirectory to make mkdocs work in a subdirectory

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

(cherry picked from commit eaeb88401d)
Signed-off-by: David Mehren <git@herrmehren.de>

docs/content/dev/db-schema.plantuml

@@ -0,0 +1,154 @@
+@startuml
+hide circle
+skinparam nodesep 60
+
+entity "Note" {
+  *id : uuid <<generated>>
+  --
+  *shortid : text
+  alias : text
+  *viewcount : number
+  *ownerId : uuid <<FK User>>
+  description: text
+  title: text
+}
+
+entity "User" {
+  *id : uuid <<generated>>
+  --
+  *userName : text
+  *displayName : text
+  *createdAt : date
+  *updatedAt : date
+  photo : text
+  email : text
+}
+
+entity "AuthToken" as authToken{
+  *id : number <<generated>>
+  --
+  *userId : uuid
+  *accessToken : text
+}
+
+entity "Identity" {
+  *id : number
+  --
+  *userId : uuid <<FK User>>
+  ' Identifies the external login provider and is set in the config
+  *providerName : text
+  *syncSource : boolean
+  *createdAt : date
+  *updatedAt : date
+  ' The unique identifier of a user from the login provider
+  providerUserId : text
+  ' Token used to access the OAuth provider in the users name. Can be NULL
+  oauthAccessToken : text
+  ' Password hash. Can be NULL
+  passwordHash : text
+}
+
+entity "Session" {
+  *id : text
+  --
+  *expiredAt : number
+  *json : text
+}
+
+
+entity "Revision" {
+  *id : number <<generated>>
+  --
+  *noteId : uuid <<FK Note>>
+  *content : text
+  *patch : text
+  *createdAt : date
+  *length : number
+}
+
+entity "Authorship" {
+  *id : uuid <<generated>>
+  --
+  *userId : uuid <FK User>>
+  *startPos : number
+  *endPos : number
+  *createdAt : date
+  *updatedAt : date
+}
+
+entity "RevisionAuthorship" {
+  *revisionId : number <<FK Revision>>
+  *authorshipId : uuid <<FK Authorship>>
+}
+
+entity "AuthorColors" {
+  *noteId : uuid <<FK Note>>
+  *userId : uuid <<FK User>>
+  --
+  *color : text
+}
+
+
+entity "NoteUserPermission" {
+  *userId : uuid <<FK User>>
+  *noteId : uuid <<FK Note>>
+  --
+  *canEdit : boolean
+}
+
+entity "Group" {
+  *id : number <<generated>>
+  --
+  *name : text <<unique>>
+  *displayName : text
+  ' Is set to denote a special group
+  ' Special groups are used to map the old share settings like "everyone can edit"
+  ' or "logged in users can view" to the group permission system
+  *special : boolean
+  }
+
+entity "NoteGroupPermission" {
+  *groupId : number <<FK Group>>
+  *noteId : uuid <<FK Note>>
+  --
+  *canEdit : boolean
+}
+
+entity "Tag" {
+  *id: number <<generated>>
+  *name: text
+}
+
+entity "MediaUpload" {
+  *id : text <<unique>>
+  --
+  *noteId : uuid <<FK Note>>
+  *userId : uuid <<FK User>>
+  *backendType: text
+  backendData: text
+  *createdAt : date
+}
+
+User "1" -- "0..*" Note: owner
+User "1" -u- "1..*" Identity
+User "1" - "1..*" authToken
+User "1" -l- "1..*" Session
+User "1" - "0..*" MediaUpload
+User "0..*" -- "0..*" Note
+User "1" - "0..*" Authorship
+
+(User, Note) . AuthorColors
+
+Revision "0..*" - "0..*" Authorship
+(Revision, Authorship) .. RevisionAuthorship
+
+MediaUpload "0..*"  -- "1" Note
+Note "1" - "1..*" Revision
+Note "0..*" -l- "0..*" Tag
+Note "0..*" -- "0..*" Group
+
+User "0..*" -- "0..*" Note
+(User, Note) . NoteUserPermission
+(Note, Group) . NoteGroupPermission
+
+@enduml