add table of content (preview) (#3050)
add table of content (preview) (#3050)

* add toc (preview)

* remove toc in toc

Signed-off-by: Moni <34f0f7d4e30318040e6078e1ff30b348267d1468@gmail.com>

* fix sublinks

* fix indentation

* remove redundant table links

* update caps and indent

* remove axios

Co-authored-by: Moni <34f0f7d4e30318040e6078e1ff30b348267d1468@gmail.com>
Co-authored-by: Jay <4f5661b92532aa65dc137cefa1d321b17b131199@gmail.com>
mzabriskie/axios,mzabriskie/axios,mzabriskie/axios,axios/axios,axios/axios,axios/axios