Do not crash if metadata fails to render and enable OGP and TwitterCard by default
Closes #1034
See merge request pleroma/pleroma!1388
### Fixed
- Not being able to pin unlisted posts
+ - Metadata rendering errors resulting in the entire page being inaccessible
- Mastodon API: Handling of search timeouts (`/api/v1/search` and `/api/v2/search`)
+- Mastodon API: Embedded relationships not being properly rendered in the Account entity of Status entity
### Changed
+ - Configuration: OpenGraph and TwitterCard providers enabled by default
- Configuration: Filter.AnonymizeFilename added ability to retain file extension with custom text
### Changed