feat: operations with cells, builders and slices

Plus some of the descriptions (not all just yet!)

Author: novusnota

.github/temp-archive/new-page-for-builder-cell-slices.mdx

@@ -30,6 +30,8 @@
     "nanotons",
     "nextra",
     "Offchain",
+    "quadtree",
+    "quadtrees",
     "RAWRESERVE",
     "respecifying",
     "Satoshi",