feat: Add install script

[sempasha]

Installation script requested in Zonnev/elementaryos-firefox-theme#196 is here!
Please test it before merge:

bash <(wget --quiet --output-document - "https://raw.githubusercontent.com/sempasha/elementaryos-thunderbird-theme/main/install.sh")

And later after merge:

bash <(wget --quiet --output-document - "https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/install.sh")

[Zonnev]

Hi @sempasha Thank you for making this script! Only one thing happened with the flatpak version of Thunderbird: the script downloaded flatpak.css, but it doesn't exist in the repository. The script is supposed to download an userChrome and base.css also for the flatpak version of Thunderbird (the same as other versions of Thunderbird). Hope you can adjust that, many thanks! :)

[Zonnev]

Sorry for this late reaction, but one more thing I noticed is that in the flatpak installation it doesn't install in the right folder. The right folder is a <profilenumber>.default-release folder, not a <profilenumber>.default folder. Can you look at that issue too? Thank you!

[Zonnev]

Hi @sempasha, this is the output of the script on my pc. I think you can see the script does find two Flatpak profiles but only installs in one (at the end).

So there are two issues:

1. The script should install a base.css and an userChrome.css (from the window controls folders) for Flatpak profiles.
2. The script should install in all Flatpak profiles.

I still hope you can solve these issues!

🐦 Thunderbird Elementary Theme installation

🔍 Searching for application profiles:
  ✅ Found 🐦 Thunderbird profiles:
    📁 ~/.thunderbird/dqzdpvjr.default-release-1
    📁 ~/.thunderbird/xwpbrlqc.default-beta
    📁 ~/.thunderbird/etfcvz4u.default
    📁 ~/.thunderbird/1xg6lw3m.default-release
  ✅ Found 🐦 Thunderbird (📦 Flatpak) profiles:
    📁 ~/.var/app/org.mozilla.Thunderbird/.thunderbird/enbkmhsc.default
    📁 ~/.var/app/org.mozilla.Thunderbird/.thunderbird/3m7e610l.default-release

🔧 Installing theme at 🐦 Thunderbird profile 📁 ~/.thunderbird/dqzdpvjr.default-release-1
  ⬇️  Downloading base.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/base.css)
  ⬇️  Downloading userChrome.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/Elementary/userChrome.css)

🔧 Installing theme at 🐦 Thunderbird profile 📁 ~/.thunderbird/xwpbrlqc.default-beta
  ⬇️  Downloading base.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/base.css)
  ⬇️  Downloading userChrome.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/Elementary/userChrome.css)

🔧 Installing theme at 🐦 Thunderbird profile 📁 ~/.thunderbird/etfcvz4u.default
  ⬇️  Downloading base.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/base.css)
  ⬇️  Downloading userChrome.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/Elementary/userChrome.css)

🔧 Installing theme at 🐦 Thunderbird profile 📁 ~/.thunderbird/1xg6lw3m.default-release
  ⬇️  Downloading base.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/base.css)
  ⬇️  Downloading userChrome.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/Elementary/userChrome.css)

🔧 Installing theme at 🐦 Thunderbird (📦 Flatpak) profile 📁 ~/.var/app/org.mozilla.Thunderbird/.thunderbird/enbkmhsc.default
  ⬇️  Downloading base.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/base.css)
  ⬇️  Downloading flatpak.css (https://raw.githubusercontent.com/Zonnev/elementaryos-thunderbird-theme/main/flatpak.css)