Reorg and cleanup of economics section of docs (#14868)

* reorg validator economics

* overview cleanup

* terminology

* terminology formatting

* katex for docusaurus

* adjusted staking yield writeup

* more reorg

* move section header

* rm unlinked mds

* add new mds

* Update docs/src/inflation/terminology.md

Co-authored-by: Dan Albert <dan@solana.com>

* Update docs/src/inflation/terminology.md

Co-authored-by: Dan Albert <dan@solana.com>

* Update docs/src/inflation/terminology.md

Co-authored-by: Dan Albert <dan@solana.com>

* Update docs/src/inflation/terminology.md

Co-authored-by: Dan Albert <dan@solana.com>

* Update docs/src/inflation/terminology.md

Co-authored-by: Dan Albert <dan@solana.com>

* Update docs/src/transaction_fees.md

Co-authored-by: Dan Albert <dan@solana.com>

* addressing Dans comments in #14868

* incorporating pr commits

* trailing whitespaces

* more trailing whitespaces

* remove services link and add plot

* add plots

Co-authored-by: Dan Albert <dan@solana.com>

docs/static/katex/contrib/copy-tex.css

@@ -0,0 +1,13 @@
+/* Force selection of entire .katex/.katex-display blocks, so that we can
+ * copy/paste the entire source code.  If you omit this CSS, partial
+ * selections of a formula will work, but will copy the ugly HTML
+ * representation instead of the LaTeX source code.  (Full selections will
+ * still produce the LaTeX source code.)
+ */
+.katex,
+.katex-display {
+    user-select: all;
+    -moz-user-select: all;
+    -webkit-user-select: all;
+    -ms-user-select: all;
+}