release: Major version v1.0.0

To access the updated documentation , use the `:h github-nvim-theme`.

Deprecations Table : `:h github-theme.deprecated`
Breaking Changes   : `:h github-theme.changelog`

I want to extend my appreciation to all those who have supported my
efforts. This release would not have been achievable without the
invaluable support of my sponsors, namely @khawkins98 and @splooge, as
well as the contributions from other individuals. Thank you all for
making this release a reality.