[Hello webpage] Proposed changes

[Therese Godefroy]

Hi Hello maintainers,

We are planning to migrate all templated pages on gnu.org to HTML5 in
order to improve accessibility. But before doing this, deprecated tags
such as <tt>, <acronym> and <big> need to be removed.

The home page of Hello contains <tt>. I got rid of it, and took this
opportunity to make other minor changes:

* Replace <tt> with quotes;

* Use <kbd> for commands and <code> for directories, program names, etc.

* Rewrite some sentences to make link texts more meaningful (no URL:
screen readers spell them letter by letter).

* Replace http with https where possible.

* Remove "http://www.gnu.org"; in local URL.

* Update to the current boilerplate, and limit line width.


A diff is attached. If you agree with the changes but don't have time
to commit them right now, I will gladly do it.

Best regards,
Thérèse

hello.diff
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