Fix link to lex.html
Fix anchors for each statements
Fix anchors more
Fix `ForeachType`

Optional `TypeCtors` now allowed
Merge pull request #458 from 9rnsr/grammar

Tweak Grammar page
Do https://github.com/D-Programming-Language/dlang.org/pull/271 in small steps
Merge pull request #459 from andralex/style.css

Do https://github.com/D-Programming-Language/dlang.org/pull/271 in small...