[openssl/web] 364ddb: Convert all top .html to .md

[Richard Levitte]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/web
  Commit: 364ddb0bb1b9a4e922f9739a95ab149f04c893ec
      https://github.openssl.org/openssl/web/commit/364ddb0bb1b9a4e922f9739a95ab149f04c893ec
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2022-07-15 (Fri, 15 Jul 2022)

  Changed paths:
    M .gitignore
    R err404.html
    A err404.md
    R index.html
    A index.md
    M roadmap.md
    R sidebar.shtml
    R template-file.html

  Log Message:
  -----------
  Convert all top .html to .md

Pandoc makes this really easy:

    pandoc -f html -t markdown -o index.html index.md

Only very minute small manual adjustments are needed afterwards.

Partial fix of #324

Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/web/pull/343)