fix(meta): apply new metadata

- Reset version to 0.1.0, this closes #16.
- Switch project name to "happy", this closes #14.
- Switch author to Nikita Litvin
- Change description to "Extension for Vk.com insired by
and based on VkOpt."
- Change homepage url to https://github.com/deltaidea/happy
- Remove copyright notice in each source file.
Perhaps we should add a link to LICENSE.md later.