Added
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- new renderer for markdown and rst based on Laika
- rendering of README files in rst format on the repo overview page
- RequestId middleware to generate request id headers
- Show last tag and link to details if present on the overview page.
- logging of requests on the trace level
- allow managing administrators for an organisation
- allow organisation administrators to edit the organisation
- `HttpBaseRoute` for cleaner implementation of HTTP enpoints

Changed
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- Adjust error logging to include request id.
- CODINGSTYLE: adjust to removal of quotes in SQL files
- refactoring of hub form types
- Tickets: Change page title and include possible ticket search status.
- switch to bouncy castle provider for JDK 1.8 and later
- changes to several page titles
- CONTRIBUTING: Remove TODO and rephrase minimal about forks and branches.

Removed
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- common mark dependencies and markdown renderer

Fixed
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- local links from the repository overview page
- todo rendering
- indentation in markdown files
- crash if repository contains no tags
- "edit organisation settings" link always shown