fix type of keywords entry in frontmatter (in /docker-hub/ dir)

keywords should be a string, not an array containing one string

Signed-off-by: Gaetan de Villele <gdevillele@gmail.com>

docker-hub/accounts.md

@@ -1,7 +1,6 @@
 ---
 description: Your Docker ID
-keywords:
+keywords: Docker, docker, trusted, sign-up, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation
-- Docker, docker, trusted, sign-up, registry, accounts, plans, Dockerfile, Docker Hub, docs,  documentation
 title: Docker ID and Docker Hub accounts
 ---
 

docker-hub/bitbucket.md

@@ -1,7 +1,6 @@
 ---
 description: Docker Hub Automated Builds using Bitbucket
-keywords:
+keywords: Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, trusted, builds, trusted builds,  automated builds, bitbucket
-- Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, trusted, builds, trusted builds,  automated builds, bitbucket
 title: Configure automated builds with Bitbucket
 ---
 

docker-hub/builds.md

@@ -1,7 +1,6 @@
 ---
 description: Docker Hub Automated Builds
-keywords:
+keywords: Dockerfile, Hub, builds, trusted builds, automated builds
-- Dockerfile, Hub, builds, trusted builds, automated builds
 title: Configure automated builds on Docker Hub
 ---
 

docker-hub/github.md

@@ -1,7 +1,6 @@
 ---
 description: Docker Hub Automated Builds with GitHub
-keywords:
+keywords: Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, trusted, builds, trusted builds,  automated builds, GitHub
-- Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, trusted, builds, trusted builds,  automated builds, GitHub
 title: Configure automated builds from GitHub
 ---
 

docker-hub/index.md

@@ -1,9 +1,8 @@
 ---
+description: Docker Hub overview
+keywords: Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, accounts, organizations, repositories, groups, teams
 redirect_from:
 - /docker-hub/overview/
-description: Docker Hub overview
-keywords:
-- Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, documentation, accounts, organizations, repositories, groups,  teams
 title: Overview of Docker Hub
 ---
 

docker-hub/official_repos.md

@@ -1,7 +1,6 @@
 ---
 description: Guidelines for Official Repositories on Docker Hub
-keywords:
+keywords: Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, official,image, documentation
-- Docker, docker, registry, accounts, plans, Dockerfile, Docker Hub, docs, official,image, documentation
 title: Official repositories on Docker Hub
 ---
 

docker-hub/orgs.md

@@ -1,7 +1,6 @@
 ---
 description: Docker Hub Teams and Organizations
-keywords:
+keywords: Docker, docker, registry, teams, organizations, plans, Dockerfile, Docker Hub, docs, documentation
-- Docker, docker, registry, teams, organizations, plans, Dockerfile, Docker Hub, docs,  documentation
 title: Organizations and teams in Docker Hub
 ---
 

docker-hub/repos.md

@@ -1,7 +1,6 @@
 ---
 description: Your Repositories on Docker Hub
-keywords:
+keywords: Docker, docker, trusted, registry, accounts, plans, Dockerfile, Docker Hub, webhooks, docs, documentation
-- Docker, docker, trusted, registry, accounts, plans, Dockerfile, Docker Hub, webhooks, docs,  documentation
 title: Repositories on Docker Hub
 ---
 

docker-hub/webhooks.md

@@ -1,7 +1,6 @@
 ---
 description: Docker Hub Automated Builds
-keywords:
+keywords: Docker, webhookds, hub, builds
-- Docker, webhookds, hub, builds
 title: Webhooks for automated builds
 ---