Merge branch 'simplify-gitlab-ci.yml' into 'master'

Move index.html to simplify .gitlab-ci.yml

## What does this MR do?

- move `index.html` to public folder
- simplify `.gitlab-ci.yml`

## Are there points in the code the reviewer needs to double check?

Not really...

## Why was this MR needed?

Every build moves the `index.html` to the public folder—which is unnecessary if it can be there from the beginning.

## What are the relevant issue numbers?

None.


See merge request !10

.gitlab-ci.yml

@@ -3,9 +3,7 @@ image: alpine:latest
 pages:
   stage: deploy
   script:
-  - mkdir .public
+  - echo 'Nothing to do...'
-  - cp -r * .public
-  - mv .public public
   artifacts:
     paths:
     - public

README.md

@@ -29,9 +29,7 @@ defined in [`.gitlab-ci.yml`](.gitlab-ci.yml):
 pages:
   stage: deploy
   script:
-  - mkdir .public
+  - echo 'Nothing to do...'
-  - cp -r * .public
-  - mv .public public
   artifacts:
     paths:
     - public