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/write-notes-in-foam.md

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+# Writing Notes
+
+Notes are simple text files with some extra flavor, in the shape of Markdown syntax and support for extra properties (see [[note-properties]]).
+
+## Foam Syntax
+
+Foam uses standard markdown, with a few added twists:
+- the title of a note (e.g. in the [[graph-visualization]]) is given by precedence based on:
+  - the `title` property (see [[note-properties]])
+  - the first `# heading 1`  of the file
+  - the file name
+
+
+## Markdown Syntax
+With markdown we can style our notes in a simple way, while keeping the document a simple text file (the best way to future-proof your writings!).
+
+You can see the formatted output by running the `Markdown: Open Preview to the Side` command.
+
+Here is a high level overview of Markdown, for more information on the markdown syntax [see here](https://commonmark.org/help/).
+
+# Heading 1
+
+## Heading 2
+
+### Heading 3
+
+#### Heading 4
+
+##### Heading 5
+
+###### Heading 6
+
+This is a [link to google](https://www.google.com).
+
+This is a wiki link (aka internal link) to [[note-properties]].
+
+Here is an image:
+![image](../../attachments/foam-icon.png)
+
+> this is a blockquote
+> it can span multiple lines
+
+- list item
+- list item
+- list item
+
+1. One
+2. Two
+3. Three
+
+This text is **in bold** and this is *italic*.
+
+The following is a horizontal rule
+
+---
+
+This is a table:
+| Column 1 | Column 2 |
+| -------- | -------- |
+| R1C1     | R1C2     |
+| R2C1     | R2C2     |
+
+You can `inline code` or
+```
+you can create
+code blocks
+```
+
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[note-properties]: ../features/note-properties.md "Note Properties"
+[graph-visualization]: ../features/graph-visualization.md "Graph Visualization"
+[//end]: # "Autogenerated link references"