[www] Remove implemented Clang SA projects
Two Clang Static Analyzer entries on the Open Projects page are implemented
during GSoC 2018: A checker for dangling string pointers in C++ and Using the Z3 SMT Solver to Validate Bugs Reported by the Clang Static Analyzer. This patch removes both projects mentions.
Reviewers: george.karpenkov, dergachev.a, asl
Reviewed by: asl
Subscribers: asl, mikhail.ramalho, rnkovacs, llvm-commits
Differential Revision: https://reviews.llvm.org/D57290