Improve title format for better SEO and readability

[alemohamad]

Motivation:

The homepage currently shows Swift.org - Welcome to Swift.org as the <title>, which is redundant and not ideal for SEO. Internal pages use the format Swift.org - Page Title, placing the main topic last, which is suboptimal for search engine visibility and user experience.

Additionally, using multiple hyphens in titles such as Swift.org - Install Swift - macOS can make it harder to visually parse where the subject ends and the site name begins. Replacing the separator with an em dash (—) improves clarity by visually distinguishing the content title from the site name.

Result:

This PR proposes changing the homepage title to Swift Programming Language, as it offers a more descriptive label for search engines and link previews. However, this is open to discussion — alternatives like Welcome to Swift.org may also be appropriate, depending on how the community prefers to present the project. Personally, I believe the proposed title better highlights the language itself and improves discoverability, but it's not intended as a final decision.

Internal page titles now place the page subject first, followed by the site name separated by an em dash, improving structure, clarity, and SEO performance.

[alemohamad]

@kaishin @alexandersandberg Please review this PR, as I believe it will be beneficial when the website is shared or searched for.

[davelester]

@alemohamad Thanks for this contribution! Some thoughts below:

Re: internal pages, I agree that it'd be great to remove multiple hyphens from page titles. What if we used a vertical bar instead of the em dash for greater visual separation? For example: Install Swift - macOS | Swift.org.

Re: the homepage title, I wonder if there's value to still including Swift.org in the title. Perhaps Swift Programming Language | Swift.org? I'm curious about what others in the Swift.org website workgroup think.

[alemohamad]

@davelester Thanks for your feedback. Yes, I also considered using a pipe (|) as a separator, but I thought another symbol to avoid confusion with the letter “I.” Regardless, it serves as a separator. In my opinion, we shouldn’t have Swift.org at the homepage title, but if the team believes it adds value, I can agree. The primary objective was to avoid repeating Swift.org on the homepage. 😉