Remove symlinks from docs

[jonatan-ivanov]

Other than they don't work on windows, Gradle FS watching does not support them either: https://docs.gradle.org/current/userguide/file_system_watching.html#supported_file_systems

[shakuzen]

symlinked files do not benefit from file system-watching optimizations.

The above quote is from the linked docs. Is it just an optimization we're missing out on for those files or the docs module then? That doesn't sound too bad. If we were to get rid of the symlinks, would we just have duplicate copies of the files used via symlink in the docs module?

[jonatan-ivanov]

I'm not sure what are the consequences for Gradle, also, I only saw the issue on CircleCI and not locally (caching?):

Gradle was unable to watch the file system for changes. Unable to watch same file twice via different paths: Already watching path: /home/circleci/micrometer-tracing/docs/modules/ROOT/examples/bridges-src/micrometer-tracing-bridge-brave/src/main.

But I guess this means that build is now not possible on vanilla Windows setups.

I haven't looked into this but we might not need to symlink files but might be able to declare a dependency on them. We can get away of having example code snippets in Micrometer without symlinks somehow, maybe we can do the same here too?