* Prioritize messaging re: using hosted Jitsi if self-hosted is not required

* Update wording for self-hosting vs hosted

* Expand requirements sentence into document section

* Simplify Ubuntu universe step

* Condense repository and package installation steps

* Add comments for package installation steps

* Simplify wording around hostname configuration

* Simplify lets-encrypt wording

* Move certificate generation step before package installation

* Expand certificate instructions

* Move conference test step to post-installation

* Rephrase installation testing / confirmation step

* Extract platform-specific installation notes

* Rephrase superuser guidance

* Replace lists.jitsi.org link with web.archive.org pointer

* Place /etc/hosts example in code block

* Remove space before colon

* Add spacing before/after 'or' (improves github markdown rendering)

* Revert "Add spacing before/after 'or' (improves github markdown rendering)"

This reverts commit 9f33beb2ab.

* Nit: clarify apt/HTTPS relationship

* Revert "Expand requirements sentence into document section"

This reverts commit cf630983c0.

* Relocate Ubuntu universe repository advice

* More concise Ubuntu universe messaging

* Revert "Extract platform-specific installation notes"

This reverts commit 7161a700cb.

* Revert "Expand certificate instructions"

This reverts commit 5c479e7ffb.

* Revert "Move conference test step to post-installation"

This reverts commit a0ee279b7c.

* Revert "Simplify wording around hostname configuration"

This reverts commit ceab0ab9cf.

* Revert "Revert "Simplify wording around hostname configuration""

This reverts commit a7127d03dc.

* Revert "Revert "Revert "Simplify wording around hostname configuration"""

This reverts commit 1e5413690e.

* Revert "Remove space before colon"

This reverts commit 35cae52722.

* Mark Let's Encrypt step as optional

* Mark Let's Encrypt step as recommended

* Clarify Jitsi repository-add heading

* Nit: remove superfluous newline

* Fixup: restore Let's Encrypt descriptive text from master branch

* Update supported Ubuntu version to 18.04 (LTS)

* Add Ubuntu release codename

* Update minimum supported Debian version to 9 (Stretch)

* Undo relocation of Let's Encrypt script instructions

* Add Jitsi Meet mobile app certificate requirement notice

* 'Note' formatting consistency

* Rephrase sudo language

Fix "toggleCamera" description. switch instead of turn off/on

"toggle camera" is to switch front to rear or rear to front.
The french translation said "on/off camera", it's not exactly that

* Completely removes jetty config and defaults to nginx.

* Force configuring nginx or apache.

* Fixes certs when upgrading from jetty.

* Fixes certs and restarts jvb.

* Turnserver config conflicts apache2.

* Multi-domain sed only for nginx.

* Updates docs removing jetty.

- removed paragraph about old Debian Wheezy, the link is broken, and Wheezy doesn't even get security updates anymore, so seems unlikely anyone would do a new install with it.
- clarified that Let's Encrypt script uses only the HTTP challenge.
- added links to a few things that newbies might want to look up (nginx, apache, jetty, SIP, FQDN, Let's Encrypt, etc.
- added some basic debugging starting points, based on my experience
- some minor grammatical tweaks
- other minor tweaks

fix broken nginx ipv6 listeners

Add ability to invite users which will use the share sheet or dialog
dynamically.

- re-add thepand icon, shaped like a pill
- round top corners

"cryptée" does not exist in french, it's "chiffrée" here. More informations about this here : https://chiffrer.info/

Prevent possible json parse errors when the configuration values are
commented or commented out.

Change inaccurate translation of toggle camera.

fixes #5260 (#5279)

chore(package.json): Update js-utils.

We see tons of crashes on Samsung and Huawei devices. It's really not worth the
headache anymore.

Fixed a lot of punctuation and spelling mistakes. "Speaker" means "Lautsprecher" in the context of audio devices. Rephrased a sentence to make it sound better.

Error correction in "appDescription" (open course instead of open source).

ITALIAN translation - added last missing string

Hi,
I added some missing translations and changed some that were wrong, or improvable: from a 70% translation and a 30% missing, to what I think should be an 85%-90% of translated lines.

I really wish to express my personal compliments to the persons that made the core translation, because it is very fluid, original and smart.

(tell me what I should have to do: I'm pretty new to GitHub)

I added Afrikaans missing string

Starting from version 74, firefox need to be explicitly allowed to capture the screen from an iframe for screensharing. This new Feature-Policy is called "display-capture".
See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy/display-capture