[w3c/manifest] Rewrite dir member. (#743)

Closes #742

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative behavior
* [X] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

`dir`=`auto` no longer explicitly overrides the algorithm in [BIDI]. Also the whole thing more formally uses the BIDI infrastructure.

Note: I think this is actually making a slight behavioural change which we may not be OK with (but assuming it brings it more in line with actual implementations): if the member is embedded within another string (such as "Do you want to install %s?"), the new text lets the BIDI algorithm take the wheel, whereas the old text implies (without formally stating) that it would be embedded LTR or RTL depending on the first strong character. I'll have to think on this more.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/743

-- Commit Summary --

  * Rewrite dir member.

-- File Changes --

    M index.html (38)

-- Patch Links --

https://github.com/w3c/manifest/pull/743.patch
https://github.com/w3c/manifest/pull/743.diff

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