add info about bridge-moji, https-only mode and some small changes

1. I have added some information about HTTPS-only mode and Bridge-moji.
2. Addressed #119 (comment 2810245), #119 (comment 2811934) (thanks, @emmapeel) and #119 (comment 2811697) (thanks, @gus!)
3. Added some instruction about censorship circumvention for users in China. (thanks to @gus for mentioning about this!)

assigned to @championquizzer

requested review from @emmapeel

added 7 commits

• 31b74c54...280fd260 - 6 commits from branch tpo/web:alpha
• d7802924 - Merge branch 'alpha' into 'alpha'

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added 2 commits

• 7a1439d5 - improve strings for l10n
• 13ebc49c - Merge remote-tracking branch 'refs/remotes/origin/alpha' into tb115-bridgemoji-httpsonly

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resolved all threads

added 1 commit

• ca778793 - elaborate on bridge-moji

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mentioned in commit cd022026

merged

resolved all threads