docs: CLI documentation standardization (#16563)

* docs: CLI intro + copy tweaks

* docs: CLI docs standardization

Fixes #16475

* continue on standardization

* finish first pass of formatting

* finish adding examples

* fixes

* copy edits

* Apply suggestions from code review

Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>
Co-authored-by: Amaresh  S M  <amareshsm13@gmail.com>

* put aliases in the headers

* fix --ext description

* update --rulesdir docs per feedback

* Apply suggestions from code review

Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>
Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>

* update help text

* readd cli help output

* clarify --ext description

* clarify using --rule w --no-eslintrc

* implement MD and NZ feedback

* Apply suggestions from code review

Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>
Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>

* clarify formatter example comments

* Apply suggestions from code review

Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>

* standardize all headings to Title Case

* Apply suggestions from code review

Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>

Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>
Co-authored-by: Amaresh  S M  <amareshsm13@gmail.com>
Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>

docs/src/_data/links.json

@@ -14,7 +14,7 @@
     "team": "/team",
 
     "configuring": "https://eslint.org/docs/user-guide/configuring/",
-    "fixProblems": "https://eslint.org/docs/user-guide/command-line-interface#fixing-problems",
+    "fixProblems": "https://eslint.org/docs/user-guide/command-line-interface#fix-problems",
 
     "donate": "/donate",
     "openCollective": "https://opencollective.com/eslint",