Good to know you are on the ball!

Yup, on their FAQ page:

Is Sketch available for Windows or Linux?

Due to the technologies and frameworks exclusive to OS X that Sketch has been built upon, regrettably we will not be considering supporting Sketch on either of these platforms.

Been using WordPress for quite a while. Have done lots of custom code, some theme work, some custom plugins, and keep following the WP developments. That said...I'm leaning towards something simpler. For my own site, I don't really need the complexity that WP brings.

I've been trialing Craft, which is a bit different but feels much like WordPress with a modern codebase and interface. I lean a bit more towards Kirby, as it provides really straightforward objects and functionality. I rather like the way blueprints and templates work together, and how it is possible to use controllers and snippets. The big question I have ahead of me is how to migrate my content.

The hr element is not deprecated. It serves a purpose; in earlier HTML versions it was to literally draw a horizontal line, but in HTML5 it has the semantic meaning of creating a thematic break between paragraphs.

The spec: http://www.w3.org/TR/html-markup/hr.html

Example: https://html.spec.whatwg.org/multipage/semantics.html#the-hr-element

That it draws a horizontal line is beside the point, adding the element indicates that the topic is changing. Adding a top or bottom border on block elements may visually divide content, but there is no semantic value to doing so. An hr on the other hand can be styled, or even made invisible, yet it adds meaning.

Built-in support for Composer, Grunt, and Bower are super time-savers.

If the one stylesheet is not minified and gzipped, that's a good first step to take. Since CSS is just text, it compresses well. Separate files, even if small, require additional requests which just moves the bottleneck.

From a management perspective, a preprocessor like Sass can be used to manage component styles in separate files, then combine them together into one file for the browser to use. Alternately, plain CSS files can be concatenated (joined together) before upload to the server, or by the server, so the browser only gets the one file.

Been using LastPass for quite some while. Simple and effective. Cross-platform too; web interface + plugin for Chrome + app for Windows 8 + app for Blackberry 10 = I am set.

I started using Toggl not long ago. Really nice tool. Bummer that there's no BlackBerry 10 or WinRT apps (yet?) but the web interface is well-done and mobile-friendly.