DOC-8132-C6 -- Move C code_snippets module in to clang (#512)

* Preliminary work on C language documentation snippets

* 1. Move the code module from JB's initial commit into modules/clang/ examples/code_snippets; this also removes the preexisting debris from examples/
2. Add the include:: for  the getting-started code into the verify/build page
https://issues.couchbase.com/browse/DOC-8132

Co-authored-by: Jim Borden <[email protected]>

Author: ibsoln

modules/ROOT/pages/_partials/_attributes-local.adoc

@@ -299,7 +299,7 @@ endif::[]
 :snippets-pfx: example$code_snippets/
 :snippets-content--android-kotlin: {lang-mod-android}:{snippets-pfx--android-kt}Examples.kt
 :snippets-content--android-java: {lang-mod-android}:{snippets-pfx--android-java}Examples.java
-:snippets-content--clang: {lang-mod-clang}:{snippets-pfx}SampleCodeTest.cc
+:snippets-content--clang: {lang-mod-clang}:{snippets-pfx}main.c
 :snippets-content--csharp: {lang-mod-csharp}:{snippets-pfx}Program.cs
 :snippets-content--java: {lang-mod-java}:{snippets-pfx}Examples.java
 :snippets-content--objc: {lang-mod-objc}:{snippets-pfx}SampleCodeTest.m