Update README.md

[grahamperrin]

Short term

Specifics

The specific list of features at https://github.com/MrAlex94/Waterfox/blob/master/README.md#features is probably a little outdated.

From #267 (comment):

… XUL compatibility, its the USP …

– and so on.

(Compatibility is a selling point, but I don't see XUL compatibility as the sole unique selling point.)

Non-specific

More broadly – non-specifically – we have phrases such as:

… ethos of … customisation and choice, while staying up to do date with the rapidly evolving browser landscape. …

That's probably a good fit for the preamble at https://github.com/MrAlex94/Waterfox/blob/master/README.md – currently a single paragraph, might be improved with some use of bullet points.

Long term (future)

I guess:

1. shift about Waterfox content into https://staging.waterfoxproject.org/about/
2. a highly condensed README.md with reference to an /about/ URL.

[MrAlex94]

Good suggestions, 56.1 is a big improvement of everything, including the README in the repo, which I may include instructions with as well - or maybe a separate BUILD.md.

[grahamperrin]

Meta, tracking: #582