Use GuardianTextEgyptian everywhere (AA-561 and GLA-633)

[maxspencer]

This PR builds upon #842, it:

• includes the GuardianTextEgyptian font files in the templates repo,
• modifies the SCSS to use those fonts on both platforms,
• removes their old equivalents (egyptiantext-*.otf).

This PR should not be merged until iOS are happy with the changes and have had chance to test them.

[webb04]

@maxspencer should this be merged?

[maxspencer]

@webb04 I think so, but I'm confused because it seems that the previous PR #842 has been reverted now (looking at the diff here). It would still be right to check that this change is OK with iOS as it effects them.

[JamieB-gu]

@maxspencer can we close this?

[maxspencer]

@JamieB-gu what a blast from the past - Ideally we'd merge it to get rid of those old font names, but if it's causing you trouble then feel free to close.

[JamieB-gu]

It would still be right to check that this change is OK with iOS as it effects them.

@SLambrakis @faresite @dbk78 @aoifemcl15 @GiuliaAriu what do you think?

[maxspencer]

@JamieB-gu I am looking through my old open PRs in prep for leaving. I think we should merge this one, what do you think?