Introduces the "Gitlab Pages" hosting. (#595)

* Create gitlab-pages.md

Init

* Update gitlab-pages.md

* Update gitlab-pages.md

* Add Lic key update

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hosting/gitlab-pages.md

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+---
+icon: git-compare
+tags: [guide]
+---
+
+# Gitlab-Pages 
+
+Add a simple CI/CD pipeline to the project to automate the building and deployment of the Retype powered website via Gitlab Pages.
+
+## Summary
+
+- [x] Add a **.gitlab-ci.yml** file to the Repository 
+- [] Add a License key to the ENV Variables
+- [x] commit changes to deploy to pages
+
+## .gitlab-ci.yml
+
+Add the following **.gitlab-ci.yml** file to the project within the root folder.
+
+```yaml .gitlab-ci.yml
+image: node:latest
+
+before_script:
+  - npm install retypeapp --global
+
+stages:
+  - deploy
+
+pages:
+  stage: deploy
+  script:
+  - retype build --secret $RETYPE_SECRET --output public
+  artifacts:
+    paths:
+    - public/
+  only:
+  - main
+
+```
+Gitlab will use the latest available **node** image from the Gitlab Registry and Download & install the latest version of `retype` via ***npm***.
+
+```yml
+image: node:latest
+
+before_script:
+  - npm install retypeapp --global
+```
+
+`pages` will be triggerd by the deploy stage.
+
+`--secret $RETYPE_SECRET ` is optional.
+
+the `only: main` argument make sure the rebuild is only triggered if commit new code is commited to the main branch.
+
+```yml
+pages:
+  stage: deploy
+  script:
+  - retype build --secret $RETYPE_SECRET --output public
+  artifacts:
+    paths:
+    - public/
+  only:
+  - main
+```
+
+Commit the **.gitlab-ci.yml** file and push to the repo.
+
+## RETYPE_SECRET
+
+If the project requires a Retype License Key,
+that key can be configured as an ENV:var by adding a `RETYPE_SECRET` secret to the repository.
+Doing so by adding a variable to `https://gitlab.com/[user]/[project]/-/settings/ci_cd`
+Variable type must be **standard**, its also adviced to mask and protect the variable.
+
+---
+
+After the pipeline finished successfully, the page is online and can be viewed by visiting `https://[username].gitlab.io/[project]/`