layout.tt: make the header constrained to the center

Dependencies

• [2] SWXX2O4A Update boostrap to latest 4.3.1
• [3] TQKGQ5R3
• [4] HRAFVVOE make logo configurable via HYDRA_LOGO env var
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/root/layout.tt at line 50
  [2.732294]→[2.732294:732842](∅→∅)
  − <a class="navbar-brand" href="[% c.uri_for(c.controller('Root').action_for('index')) %]">

  − [% IF logo == "" %]

  − Hydra

  − [% ELSE %]

  − <img src="[% c.uri_for(logo) %]" alt="Hydra Logo" class="logo" />

  − [% END %]

  − </a>

  − <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbarSupportedContent">

  − <span class="navbar-toggler-icon"></span>

  − </button>

  − <div class="collapse navbar-collapse" id="navbarSupportedContent">

  − [% PROCESS topbar.tt %]
  [2.732294]

  [3.4730]
  + <div class="container">

  + <a class="navbar-brand" href="[% c.uri_for(c.controller('Root').action_for('index')) %]">

  + [% IF logo == "" %]

  + Hydra

  + [% ELSE %]

  + <img src="[% c.uri_for(logo) %]" alt="Hydra Logo" class="logo" />

  + [% END %]

  + </a>

  + <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbarSupportedContent">

  + <span class="navbar-toggler-icon"></span>

  + </button>

  + <div class="collapse navbar-collapse" id="navbarSupportedContent">

  + [% PROCESS topbar.tt %]

  + </div>