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Redesign nav, add privacy and about pages for splash site

See merge request team-friendo/signalboost!481

* obtain fresh docker image by pulling from registry rather than
  rebuilding locally
* cd to `splash` root rather than `signalboost` root. the latter is a
  vestige of using old docker build process, and messes up calls to docker-compose

[#382] Resolve "give admins more warning before deleting channel"

Closes #382

See merge request team-friendo/signalboost!480

side-effects:
* log errors in destroy request issuing and processing
* cleanup `_hoursToLive` helper

add notification logic to `registrar.phoneNumber.destroy#processDestructionRequest`:

* use `repository.destructionRequest#getNotifiableDestructionTargets()`
  to retrieve all destruction requests that have not been notified in
  over 8 hours
* calculate the remaining time to live of each channel (rounded to
  nearest day)
* construct a pending deletion message in each admin's language around
  this number and send it to each admin

side-effects:

* extend `notifier#notifyAdmins` to support notification keys for
  notifications that are functions with arguments (and not just static
  strings)
* add `util#millisAs`: convenience func to convert milliseconds to
  different units (weeks, days, hours, minutes)

* retrieve all pending destruction requests that have not been
  notified in at least 1 day

[385] consolidate all "bad message" execute logic into one function

Closes #385

See merge request !479

[384] eliminmate vestigal `UNAUTHORIZED` paths in execute layer

Closes #384

See merge request !478

* in MR !477 we introduced a centralized approach to handling and
  returning early from incoherent messages containing
  comamnds (including a sender issuing a command they are not
  authorized to issue). this is a better approach that is more
  cohesive and easy to reason about. yay!
* it also makes unnecessary the scattered authorization checks in
  every method in `execute` that might only be issuable by someone
  with a certain membership status. the previous MR removed the tests
  for those code paths but not the code paths.
* this MR removes the code paths (and cleans up `execute` a bit while
  we're at it. :))

[#377] Resolve "BUG: properly handle out-of-context no-payload commands"

Closes #377

See merge request !477

also make it take up more lines

* these cases used to be handled as branches of the tests for their
  individual commands (if admin-only commadns were issued by non-admins
  or no-payload-commands used to have payload)
* however, we have now grouped coverage for all such cases more
  cleanly in the `ambiguous messages containing commands` test branch
* we had left these pending vestigal tests as breadcrumbs in case we
  wanted to restore the old testing pattern (which we don't), and now
  leave this commit as a breadcrumb-of-a-breadcrumb in case we change
  our midn

GIVEN hotline messages enabled
* WHEN a subscriber sends Hello everyone or Accept the consequences (or any other no-payload command, see below)
* THEN the message should be treated like a hotline message and forwarded to admins

GIVEN hotline messages disabled
* WHEN a subscriber sens Hello everyone (or any sentence starting with a 1-word command)
* THEN the message should trigger an error message:
  * IF command is issuable by subscriber/rando (see below)
    * THEN respond with current error message. ("did you mean to X?")
  * IF the command is not issuable by a subscriber
    * THEN respond with a generic "i don't understand, i didn't send that, use HELP" message

GIVEN hotline messages in any state
* WHEN an admin or rando sends Hello everyone it triggers the "no payload" error message above (potentially we should add "were you trying to send a broadcast message?" to error for admins?)

SIDE EFFECT:  prompt admin to use broadcast when handling unecessary payload

Resolve "exempt SUPPORT_CHANNEL and DIAGNOSTICS_CHANNEL from auto-cull job"

Closes #383

See merge request !476

Increase prometheus metric retention to 1 month

Closes #375

See merge request !454

[hf] apply stricter checks for redemption

See merge request !475

[hotfix] remove subscriber count from INFO command

See merge request !474

* we don't need to leak that to any random person who sends INFO!
* while we're at it, remove the cute joke about cops

[hotfix] shorten expiry times for channels, hotline messages, invites

See merge request !473

shorten expiry times as follows:

* channels: 4 weeks -> 1 week
* hotline message joins: 4 weeks -> 3 days
* invites: 2 weeks -> 1 week

Resolve "BUG: admins sending messages disables disappearing message timer"

Closes #356

See merge request !471

* SYMPTOM: admin sending message with disappearing message set to any
  non-zero value will turn disappearing messages off (always)
* CAUSE:
  * for whatever reason, signald now relays normal text messages with
    the `expiresInSeconds` fields incorrectly set to 0
  * this was triggering `dispatcher.detectUpdatableExpiryTime` to think
    it was handling a `setExpiry` message (when in fact it was not)
* FIX:
  * modify `detectUpdatableExpiryTime` to exclude any message with a
    non-empty body or attachments fields for consideration as an
    expiry time udpate message (which works b/c since all true expiry
    time update messages have empty bodies)

* upstream MR: https://gitlab.com/thefinn93/signald/-/merge_requests/29
* upstream commit: https://gitlab.com/thefinn93/signald/-/commit/4d5ea9ff49574bedffec2418d7b5168e0663017b
* team-friendo MR: signald-fork!24
* team-friendo commit: signald-fork@6735f6a9
* current as of: 2020-10-25