[ADD] website: new blog demo snippets

(cherry picked from commit 6c6df546eb5a99d00d62fc6b497b4b861431423e)
(closes #2631)
[IMP] base_action_rule: allow using the CharDomain widget
to set the filter and pre-update filter. Using ir.filters is still
possible, but is not the only way anymore of setting the domains
used in the base action rules.
[IMP] crm, project, hr_recruitment: star (priority) management: less possible values, too much stars are too much tears !
[IMP] account: remove inexistant sequence get

There is no sequence for account.bank.statement.line to prefill the field name (Communication), better remove it.
[FIX] crm: field opportunity_ids contains only opportunities

The field opportunity_ids and opportunity_count should only contain opportunities (and not leads).
This was confusing on the partner kanbans where the field opportunity_count included leads.
[FIX] base_action_rule: typo when committing base action rule
update, evaluate the action filter_domain, not its non-existing context.
[REV] website: new blog demo snippets

This reverts commit 7246b8105bdebdd175ca82d5018f68e15e60eb43.
[FIX] web_tip: wait for chatter to fetch messages; handle resize