Add MASVS index

[cpholguera]

Added MASVS index mapping to useful Cheat Sheets.

[mackowski]

Wow, nice :) thank you @cpholguera - this PR also show that we need to add some content for V6 and V8

[mackowski]

To add new page (outside of cheatsheets directory) we also need to update generating the MkDocs. I think that these three PR can help with that:

• Update Generate_Site.sh add index top 10 #735
• Generate IndexTopTen.md #736
• Create index top 10 MkDocs folder structure #737
  If you do not want to do that I can make another PR with changes to the site generation :)

[cpholguera]

Hi @mackowski, I've fixed all generation scripts, please let me know if something else is needed.

Regarding V6 and V8, absolutely! and we will address that, maybe we need some new ones or we can also contribute to others (as in #852) so that we don't have duplicated content. In the MSTG/MASVS we want to rely more on other standards and in the Cheat Sheets.

[mackowski]

Looks good. I will merge and build it.

[mackowski]

@cpholguera it is live https://cheatsheetseries.owasp.org/IndexMASVS.html :-)

[cpholguera]

Awesome @mackowski, thanks a lot! We'll announce it soon in our official accounts 🙌

[cpholguera]

After seeing it rendered I noticed some minor things to be fixed. Here they are fixed: #856

[mackowski]

@cpholguera #856 was merged and should be in prod