Exluding v0.8.1 and v0.7 from the config dropdown
Exluding v0.8.1 and v0.7 from the config dropdown

Older tags of the repo don't have the configuration.md file
that the docs/index.html file uses to display configuration options.
Removing them from the list since they don't apply to the use case of the
documentation page.

graydon/rust,aidancully/rust,graydon/rust,rust-lang/rustfmt,SingingTree/rustfmt,aidancully/rust,rust-lang/rustfmt,graydon/rust,graydon/rust,aidancully/rust,SingingTree/rustfmt,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust