Add the web report page

This commit adds the web report page and all the required changes to show the page, among the most important changes:

• Add module to generate the report page
• Add web page index.html
• Update the webhook to show the page in the route /report/release/image_version
• Add script to generate the test cases -> images table
• Add initial test case table: tc_table.py
• Add css files

Signed-off-by: Luis Araujo luis.araujo@collabora.co.uk