Added onboarding and major changes to template (#28)

* removed gitlens

* adjusted various settings

* added foam onboarding to template

* removed prettier extension

* added setting to match OS color scheme

* a couple of minor changes re todos and readme

* added spellright to list of recommended extensions, and added to getting started guide

* added reference to LTeX in spell checking doc

* Added logo to readme

* fixed link to LTeX extension

* styling logo in readme

* more style experiments

docs/how-to/use-keyboard-shortcuts-for-editing.md

@@ -0,0 +1,43 @@
+# Use Keyboard Shortcuts for Editing
+
+Here are some keyboard shortcuts you'll love when editing your notes.
+
+This works best if you can see the result in the preview panel, run the `Markdown: Open Preview to the Side` command.
+
+- [ ] `alt+c` changes state to a TODO item. Try it while the cursor is on this line.
+
+---
+
+- [ ] `cmd+b` makes the selection bold. Select me and make me bold.
+
+---
+
+- [ ] `cmd+i` makes the selection italic. Select me and make me italic.
+
+---
+
+- [ ] `alt+shift+f` formats a table. Place the cursor in the table below and format the table.
+
+| column 1 | column 2|
+|-|-|
+| one element | another element|
+| second row| last cell|
+
+---
+
+- [ ] Paste link on selected text
+  1. copy the following text: https://google.com
+  2. select me and paste
+
+---
+
+- [ ] Search in your repo with `cmd+shift+f`: type "search"
+  - (go back to the file explorer with `cmd+shift+e`)
+
+---
+
+- [ ] Paste an image
+  1. copy an image
+  2. move your cursor to the next line, then press `cmd+alt+v` and confirm the name of the file
+  3. .
+  4. the image file has been created in `/attachments` and a reference to it has been added here